Where to Start with Insect Literature: A Beginner's Guide to Fabre, Kirby & Spence, and More

Where to Start with Insect Literature: A Beginner's Guide to Fabre, Kirby & Spence, and More

Insect literature spans from poetic natural history to rigorous taxonomy. For new readers, the key is starting with accessible, observation-driven works before tackling specialized monographs. This guide maps a progression from Fabre's vivid narratives to Kirby and Spence's systematic treatises, helping beginners build confidence and understanding.

About Our Editorial Process

This guide is prepared using historical bibliographic research,
literary references, and structured analysis of recognized works.
Books in this guide are grouped using bibliographic information, subject relationships, and the scope of the catalogue.

About This Literary Category

Insect literature emerged from the Enlightenment tradition of natural history, where observation and classification went hand in hand. Early works like Kirby and Spence's Introduction to Entomology (1815–1826) sought to elevate entomology from a 'futile and childish' pursuit to a respectable science, blending apologetics with practical advice. The 19th century saw a flowering of field guides and popular works, such as Furneaux's Butterflies and Moths (British), which combined taxonomic rigor with accessible language. Jean-Henri Fabre revolutionized the genre with his intimate, narrative-driven studies, treating insects as subjects of wonder rather than mere specimens. In the 20th century, scientific monographs like Fitch's Aspects of Reproduction and Development in the Prairie Vole and Hall's American Weasels brought quantitative rigor, while popular works like Michelet's The Insect infused natural history with philosophical reflection. Today, insect literature remains vital, bridging science and the humanities, and offering readers a window into the miniature worlds that shape our ecosystems. For beginners, the challenge is navigating between poetic observation and technical detail—a journey that rewards patience and curiosity.

Historical Date Notes

This list uses the site’s offline bibliographic registry. A first-publication year is shown only when an explicit date is present in the work’s title or issue information. Books without such evidence remain listed as Date not confirmed; no year is guessed.

  • Date not confirmed: A New Species of Heteromyid Rodent from the Middle Oligocene of Northeast Colorado with Remarks on the Skull — Key Ideas to Explore
  • Date not confirmed: American Weasels — Background and Themes
  • Date not confirmed: An Introduction to Entomology: Vol. 1 or Elements of the Natural History of the Insects — Edition Insights
  • Date not confirmed: An Introduction to Entomology: Vol. 3 or Elements of the Natural History of the Insects — Inside the Classic
  • Date not confirmed: An Introduction to Entomology: Vol. 4 or Elements of the Natural History of the Insects — Background and Themes
  • Date not confirmed: An elementary manual of New Zealand entomology — Key Ideas to Explore
  • Date not confirmed: Aspects of Reproduction and Development in the Prairie Vole (Microtus ochrogaster) — Text and Context
  • Date not confirmed: Butterflies and Moths (British) — Text and Context
  • Date not confirmed: Insect Adventures — Reading Companion
  • Date not confirmed: Insect Architecture — Reading Notes
  • Date not confirmed: The Glow-Worm and Other Beetles — Reading Companion
  • Date not confirmed: The Insect — A Closer Reading

Author Bibliographical Footprint

A breakdown of primary literary contributors and their recorded volume within this collection:

Author Name Cataloged Works Representative Titles
Kirby, William, 1759-1850, Spence, William, 1783-1860 3 An Introduction to Entomology: Vol. 1 or Elements of the Natural History of the Insects — Edition Insights, An Introduction to Entomology: Vol. 3 or Elements of the Natural History of the Insects — Inside the Classic
Drury, Dru, 1725-1803, Westwood, J. O. (John Obadiah), 1805-1893 [Editor] 3 Illustrations of Exotic Entomology, Volume 1 — Themes and Context, Illustrations of Exotic Entomology, Volume 2 — Key Ideas to Explore
Fabre, Jean-Henri, 1823-1915, Teixeira de Mattos, Alexander, 1865-1921 [Translator] 1 The Glow-Worm and Other Beetles — Reading Companion
Galbreath, Edwin C. (Edwin Carter), 1913-1989 1 A New Species of Heteromyid Rodent from the Middle Oligocene of Northeast Colorado with Remarks on the Skull — Key Ideas to Explore
Furneaux, William S. 1 Butterflies and Moths (British) — Text and Context
Fitch, Henry S. (Henry Sheldon), 1909-2009 1 Aspects of Reproduction and Development in the Prairie Vole (Microtus ochrogaster) — Text and Context
Hall, E. Raymond (Eugene Raymond), 1902-1986 1 American Weasels — Background and Themes
Hudson, G. V. (George Vernon), 1867-1946 1 An elementary manual of New Zealand entomology — Key Ideas to Explore
Giacomelli, Hector, 1822-1904 [Illustrator], Michelet, Jules, 1798-1874 1 The Insect — A Closer Reading
Rennie, James, 1787-1867, Wood, J. G. (John George), 1827-1889 [Editor] 1 Insect Architecture — Reading Notes
Fabre, Jean-Henri, 1823-1915, Goldberg, Elias, 1886-1978 [Illustrator], Teixeira de Mattos, Alexander, 1865-1921 [Translator], Zimm, Louise Hasbrouck, 1883- 1 Insect Adventures — Reading Companion
Bath, W. Harcourt (William Harcourt) 1 The Young Collector's Handbook of Ants, Bees, Dragon-flies, Earwigs, Crickets, and Flies (Hymenoptera, Neuroptera, Orthoptera, Hemiptera, Diptera). — Story, Setting & Ideas

Date Coverage

For the books discussed in this article, 0 have an explicit first-publication or issue date and 12 remain unconfirmed. Unconfirmed dates are deliberately left unresolved rather than inferred.

Critical Analysis of Core Masterpieces

The Glow-Worm and Other Beetles — Reading Companion

by Fabre, Jean-Henri, 1823-1915, Teixeira de Mattos, Alexander, 1865-1921 [Translator]

Historical Significance

This volume collects Fabre's later essays, including the glow-worm piece written at the request of his English translator, marking a shift toward accessible, magazine-style science writing.

Historical Context

Published in 2009 as a compilation, the original essays date from Fabre's later career (early 20th century), when he was already famous for his *Souvenirs Entomologiques*.

Literary Style

Conversational yet precise, using vivid physical details as entry points to deeper biological questions.

Writing Style

First-person narrative with experimental reasoning; Fabre poses hypotheses and tests them, often acknowledging gaps in evidence.

Major Themes

Insect physiology, maternal care, adaptation, the limits of observation.

Critical Reception

Fabre's work has been praised for its literary quality and scientific insight, though some critics note his anthropomorphic tendencies.

Legacy

Influenced later natural history writers and popular science, bridging amateur and professional entomology.

Adaptations

None widely known.

Recommended Audience

Beginners and general readers interested in insect behavior and natural history writing.

Reading Difficulty

Easy to moderate; accessible prose with some technical passages.

Main Characters

Glow-worm, dung-beetles (Gromphas, Phanæus Milon), various beetles.

Setting

Southern France (Fabre's home region), various field and laboratory settings.

Literary Movement

Natural history essay, late 19th-century popular science.

Similar Books

['Insect Adventures', 'The Insect']

Key Literary Concepts

  • Fabre
  • beetles
  • glow-worm
  • insect behavior
  • natural history

Related Topics

  • Insect physiology
  • Maternal care in insects
  • Scientific observation

A New Species of Heteromyid Rodent from the Middle Oligocene of Northeast Colorado with Remarks on the Skull — Key Ideas to Explore

by Galbreath, Edwin C. (Edwin Carter), 1913-1989

Historical Significance

A concise paleontological description that fills a gap in heteromyid evolution, demonstrating mid-20th-century taxonomic methods.

Historical Context

Published in 1948, based on a 1946 field collection; reflects the University of Kansas's active paleontology program.

Literary Style

Technical, precise, with a logical structure from geological context to systematic description to comparative discussion.

Writing Style

Impersonal, data-driven; uses measurements and cautious interpretation.

Major Themes

Evolutionary morphology, taxonomic description, the importance of single specimens.

Critical Reception

Well-regarded within paleontology for its careful description and restraint in interpretation.

Legacy

Contributes to the understanding of heteromyid skull evolution; cited in later studies.

Adaptations

None.

Recommended Audience

Advanced readers interested in paleontology and mammalian evolution.

Reading Difficulty

Difficult; requires familiarity with anatomical terminology and geological time scales.

Main Characters

Heliscomys tenuiceps (holotype specimen).

Setting

Middle Oligocene deposits, Logan County, Colorado, USA.

Literary Movement

20th-century paleontological monograph.

Similar Books

['American Weasels']

Key Literary Concepts

  • Heliscomys
  • Oligocene
  • heteromyid
  • paleontology
  • rodent skull

Related Topics

  • Mammalian paleontology
  • Oligocene fauna
  • Skull morphology

Butterflies and Moths (British) — Text and Context

by Furneaux, William S.

Historical Significance

A comprehensive Victorian-era field guide that systematized British Lepidoptera for amateur collectors.

Historical Context

Published in the late 19th century, a period of peak popularity for amateur natural history and butterfly collecting.

Literary Style

Descriptive and transitional, using clear structural cues to guide readers between species groups.

Writing Style

Authoritative yet accessible, with a collector's perspective and regional specificity.

Major Themes

Taxonomy, field identification, life cycles, regional distribution.

Critical Reception

Praised for its thoroughness and practical utility; a standard reference for British lepidopterists.

Legacy

Influenced later field guides; remains a historical resource for distribution data.

Adaptations

None.

Recommended Audience

Beginners and intermediate readers interested in British butterflies and moths.

Reading Difficulty

Easy to moderate; technical terms explained in context.

Main Characters

Fritillaries, Vanessas (Comma, etc.), Glanville Fritillary.

Setting

British Isles, with specific counties and habitats noted.

Literary Movement

Victorian natural history, field guide tradition.

Similar Books

['An Elementary Manual of New Zealand Entomology']

Key Literary Concepts

  • British butterflies
  • Lepidoptera
  • field guide
  • Furneaux
  • collecting

Related Topics

  • Butterfly identification
  • Moth life cycles
  • Victorian natural history

Aspects of Reproduction and Development in the Prairie Vole (Microtus ochrogaster) — Text and Context

by Fitch, Henry S. (Henry Sheldon), 1909-2009

Historical Significance

A landmark field study using large-scale live-trapping to document vole life history, setting a standard for population ecology.

Historical Context

Published in 1957, part of the University of Kansas Museum of Natural History series, reflecting post-war growth in field ecology.

Literary Style

Technical, quantitative, with a chronological structure mirroring development.

Writing Style

Detached, data-focused; uses passive voice and precise measurements.

Major Themes

Reproduction, development, mortality, competition among littermates.

Critical Reception

Highly regarded for its rigorous methodology and detailed data; a classic in mammalogy.

Legacy

Influenced later studies of small mammal population dynamics and life history theory.

Adaptations

None.

Recommended Audience

Advanced readers in ecology, mammalogy, and population biology.

Reading Difficulty

Difficult; dense with quantitative data and technical terms.

Main Characters

Prairie vole (Microtus ochrogaster).

Setting

University of Kansas Natural History Reservation, northeastern Kansas, USA, 1950s.

Literary Movement

20th-century field ecology monograph.

Similar Books

['American Weasels']

Key Literary Concepts

  • prairie vole
  • reproduction
  • development
  • field study
  • Microtus

Related Topics

  • Rodent life history
  • Population ecology
  • Field trapping methods

An Introduction to Entomology: Vol. 1 or Elements of the Natural History of the Insects — Edition Insights

by Kirby, William, 1759-1850, Spence, William, 1783-1860

Historical Significance

A foundational text that helped establish entomology as a serious scientific discipline in early 19th-century Britain.

Historical Context

First published in 1815, a time when entomology was often dismissed as trivial; the authors aimed to demonstrate its practical and intellectual value.

Literary Style

Apologetic and persuasive, blending anecdote with economic argument.

Writing Style

Learned but engaging, with frequent footnotes and named correspondents.

Major Themes

Defense of entomology, insects' role in agriculture, practical applications (angling, silk).

Critical Reception

Well-received; helped change public perception of entomology.

Legacy

A landmark in the history of entomology; influenced later popular science writing.

Adaptations

None.

Recommended Audience

Intermediate readers interested in the history of science and early entomology.

Reading Difficulty

Moderate; some archaic language but generally accessible.

Main Characters

Various insects (kestril, shrike, rook, purple grackle, silkworm).

Setting

Britain and North America, early 19th century.

Literary Movement

Early 19th-century natural history, Enlightenment science.

Similar Books

['An Introduction to Entomology: Vol. 3', 'An Introduction to Entomology: Vol. 4']

Key Literary Concepts

  • entomology history
  • Kirby and Spence
  • insect economics
  • natural history
  • agriculture

Related Topics

  • History of science
  • Insect ecology
  • Economic entomology

American Weasels — Background and Themes

by Hall, E. Raymond (Eugene Raymond), 1902-1986

Historical Significance

A comprehensive mid-20th-century monograph on the genus Mustela in the Americas, exemplifying specimen-based taxonomy.

Historical Context

Published in 1951, part of the University of Kansas Museum of Natural History series, reflecting the peak of traditional mammalogy.

Literary Style

Technical and systematic, with precise descriptions of morphology and geographic variation.

Writing Style

Impersonal, authoritative; uses standardized color references and exhaustive locality data.

Major Themes

Taxonomy, geographic variation, pelage color and environment, evolutionary mechanisms.

Critical Reception

A standard reference for weasel taxonomy; praised for its thoroughness.

Legacy

Provides baseline data for historical biogeography and studies of climate change impacts.

Adaptations

None.

Recommended Audience

Advanced readers in mammalogy, taxonomy, and evolutionary biology.

Reading Difficulty

Difficult; requires familiarity with anatomical and taxonomic terminology.

Main Characters

Mustela frenata, Mustela erminea, Mustela nivalis (various subspecies).

Setting

North and South America, various habitats.

Literary Movement

20th-century taxonomic monograph.

Similar Books

['Aspects of Reproduction and Development in the Prairie Vole']

Key Literary Concepts

  • weasels
  • Mustela
  • taxonomy
  • mammalogy
  • geographic variation

Related Topics

  • Carnivore biology
  • Pelage coloration
  • Subspecies classification

An Introduction to Entomology: Vol. 3 or Elements of the Natural History of the Insects — Inside the Classic

by Kirby, William, 1759-1850, Spence, William, 1783-1860

Historical Significance

Continues the landmark series, focusing on insect mouthparts and comparative anatomy, with a candid preface on collaborative challenges.

Historical Context

Published in 1826, the third volume of a series that took over a decade to complete, reflecting the collaborative nature of early 19th-century science.

Literary Style

Epistolary, with letters addressing specific anatomical topics; conversational yet methodical.

Writing Style

Collaborative; the preface reveals disagreements and revisions between the two authors.

Major Themes

Insect mouthpart anatomy, comparative anatomy, function of palpi, unresolved questions.

Critical Reception

Respected for its detailed anatomical descriptions and comparative approach.

Legacy

Influenced later work on insect morphology and functional anatomy.

Adaptations

None.

Recommended Audience

Intermediate to advanced readers interested in insect anatomy and history of science.

Reading Difficulty

Moderate to difficult; technical anatomical descriptions.

Main Characters

Various insects (focus on mouthparts).

Setting

Britain, early 19th century.

Literary Movement

Early 19th-century natural history, comparative anatomy.

Similar Books

['An Introduction to Entomology: Vol. 1', 'An Introduction to Entomology: Vol. 4']

Key Literary Concepts

  • insect anatomy
  • mouthparts
  • Kirby and Spence
  • comparative anatomy
  • palpi

Related Topics

  • Insect morphology
  • Functional anatomy
  • History of entomology

An Introduction to Entomology: Vol. 4 or Elements of the Natural History of the Insects — Background and Themes

by Kirby, William, 1759-1850, Spence, William, 1783-1860

Historical Significance

The final volume of the series, covering internal anatomy, physiology, classification, and practical entomology, with a strong teleological framework.

Historical Context

Published in 1826, completing the series; reflects early 19th-century natural theology and the concept of analogy.

Literary Style

Systematic and didactic, blending anatomy with philosophical and theological reflection.

Writing Style

Authoritative, with extended discussions of analogy versus affinity; includes practical sections on collecting.

Major Themes

Internal anatomy, analogy in nature, natural theology, classification, practical entomology.

Critical Reception

Praised for its comprehensive scope, though its teleological views later became outdated.

Legacy

A key document in the history of entomology and natural theology; influenced later classification systems.

Adaptations

None.

Recommended Audience

Advanced readers in history of science and entomology.

Reading Difficulty

Difficult; dense with theoretical and anatomical content.

Main Characters

Various insects (used as examples).

Setting

Britain, early 19th century.

Literary Movement

Early 19th-century natural history, natural theology.

Similar Books

['An Introduction to Entomology: Vol. 1', 'An Introduction to Entomology: Vol. 3']

Key Literary Concepts

  • insect physiology
  • analogy
  • natural theology
  • classification
  • Kirby and Spence

Related Topics

  • History of biology
  • Natural theology
  • Insect classification

An elementary manual of New Zealand entomology — Key Ideas to Explore

by Hudson, G. V. (George Vernon), 1867-1946

Historical Significance

The first comprehensive manual of New Zealand insects, designed for young collectors and amateurs.

Historical Context

Published in 1892, during a period of growing interest in New Zealand's unique fauna.

Literary Style

Instructional and vivid, alternating between textbook clarity and anecdotal observation.

Writing Style

Field naturalist's voice, with a focus on practical collecting and life history.

Major Themes

Insect anatomy, collecting methods, life cycles, New Zealand endemism.

Critical Reception

Well-received as an accessible introduction; valued for its original observations.

Legacy

A foundational text for New Zealand entomology; still referenced for historical distribution data.

Adaptations

None.

Recommended Audience

Beginners and intermediate readers interested in New Zealand insects.

Reading Difficulty

Easy to moderate; technical terms explained.

Main Characters

Bolitophila luminosa (fungus gnat), Nyctemera annulata (moth), various beetles and moths.

Setting

New Zealand, late 19th century.

Literary Movement

Late Victorian natural history, colonial science.

Similar Books

['Butterflies and Moths (British)']

Key Literary Concepts

  • New Zealand insects
  • entomology manual
  • Hudson
  • collecting
  • endemic species

Related Topics

  • New Zealand fauna
  • Insect collecting
  • Colonial natural history

The Insect — A Closer Reading

by Giacomelli, Hector, 1822-1904 [Illustrator], Michelet, Jules, 1798-1874

Historical Significance

A poetic and philosophical work that reimagines insects as fellow laborers, blending science with social commentary.

Historical Context

Published in 1858, part of Michelet's natural history series; reflects Romantic and industrial-era sensibilities.

Literary Style

Personal, metaphorical, and essayistic; uses economic and industrial analogies.

Writing Style

First-person narrative, moving between memoir and general reflection; illustrated by Hector Giacomelli.

Major Themes

Insect as artisan, the gaze of the insect, labor and survival, ugliness as function.

Critical Reception

Praised for its literary quality and imaginative sympathy; criticized for anthropomorphism.

Legacy

Influenced later nature writing and the genre of literary natural history.

Adaptations

None.

Recommended Audience

General readers interested in literary natural history and philosophical reflections on nature.

Reading Difficulty

Easy to moderate; poetic language but no technical jargon.

Main Characters

Spider, various insects (beetles, ants, etc.).

Setting

France, mid-19th century; various natural settings.

Literary Movement

Romantic natural history, 19th-century essay.

Similar Books

['The Glow-Worm and Other Beetles', 'Insect Adventures']

Key Literary Concepts

  • Michelet
  • insect as artisan
  • spider
  • natural history essay
  • industrial metaphor

Related Topics

  • Philosophy of nature
  • Animal symbolism
  • 19th-century literature

Insect Architecture — Reading Notes

by Rennie, James, 1787-1867, Wood, J. G. (John George), 1827-1889 [Editor]

Historical Significance

A detailed study of insect construction behaviors, combining original observations with editorial updates.

Historical Context

Originally by Rennie (early 19th century), edited and expanded by Wood in the mid-19th century; reflects the Victorian fascination with insect engineering.

Literary Style

Descriptive and specimen-based, with a dual-author structure (Rennie's text with Wood's bracketed additions).

Writing Style

First-person field observations (Rennie) supplemented by editorial notes (Wood); mechanistic language.

Major Themes

Insect architecture, predation, life cycles, adaptation of structures.

Critical Reception

Valued for its detailed observations; the dual authorship can be confusing.

Legacy

Contributed to the study of insect behavior and construction; a historical resource.

Adaptations

None.

Recommended Audience

Intermediate readers interested in insect behavior and historical natural history.

Reading Difficulty

Moderate; some technical descriptions but generally accessible.

Main Characters

Goat-moth caterpillar, ephemera grub, tiger beetle grub (Cicindela).

Setting

Britain (Kent, etc.), various field locations.

Literary Movement

19th-century natural history, behavioral observation.

Similar Books

['Insect Adventures', 'The Glow-Worm and Other Beetles']

Key Literary Concepts

  • insect architecture
  • Rennie
  • tiger beetle
  • burrow
  • construction behavior

Related Topics

  • Insect behavior
  • Animal architecture
  • Predatory strategies

Insect Adventures — Reading Companion

by Fabre, Jean-Henri, 1823-1915, Goldberg, Elias, 1886-1978 [Illustrator], Teixeira de Mattos, Alexander, 1865-1921 [Translator], Zimm, Louise Hasbrouck, 1883-

Historical Significance

A selection of Fabre's most engaging essays, designed for a general audience, showcasing his narrative approach to entomology.

Historical Context

Compiled and translated in the early 20th century, drawing from Fabre's *Souvenirs Entomologiques* (1879–1907).

Literary Style

Personal, anecdotal, and vivid; uses storytelling to convey scientific observations.

Writing Style

First-person narrative with a conversational tone; includes dialogue with insects.

Major Themes

Insect behavior, life cycles, patience in observation, the wonder of nature.

Critical Reception

Highly popular; praised for making science accessible and engaging.

Legacy

Introduced Fabre to a wide English-speaking audience; influenced nature writing.

Adaptations

None widely known.

Recommended Audience

Beginners and general readers; ideal for young naturalists.

Reading Difficulty

Easy; no technical jargon required.

Main Characters

Pine caterpillar, Pine Moth, various insects.

Setting

Southern France, Fabre's garden and surrounding fields.

Literary Movement

Popular science, natural history essay.

Similar Books

['The Glow-Worm and Other Beetles', 'The Insect']

Key Literary Concepts

  • Fabre
  • insect behavior
  • caterpillar
  • observation
  • natural history

Related Topics

  • Insect life cycles
  • Scientific observation
  • Nature writing

Frequently Asked Questions

I'm completely new to insect literature. Which book should I read first?

Start with Fabre's *Insect Adventures* or *The Glow-Worm and Other Beetles*. Fabre writes in a personal, narrative style that makes insect behavior fascinating without requiring prior knowledge. His essays are like short stories, each focusing on a single insect's life. After that, try Furneaux's *Butterflies and Moths (British)* for a more systematic but still accessible field guide approach.

How do I progress from popular natural history to more technical works?

After Fabre and Furneaux, move to Kirby and Spence's *Introduction to Entomology* (start with Volume 1). It's more formal but still written for a general audience. Then try the specialized monographs like *American Weasels* or *Aspects of Reproduction and Development in the Prairie Vole*—these are data-heavy and assume familiarity with scientific terminology. The key is to build vocabulary gradually.

Are there any books that focus on insect architecture or construction?

Yes, *Insect Architecture* by Rennie and Wood is entirely about how insects build nests, burrows, and traps. It's a mix of original observations and editorial updates. For a more narrative take, Fabre's *The Glow-Worm and Other Beetles* includes detailed descriptions of dung-beetle nests and the glow-worm's luminescent organ.

I'm interested in the history of entomology. Which volumes of Kirby and Spence should I read?

Volume 1 is essential for understanding how entomology was defended as a science in the early 1800s. Volume 4 covers internal anatomy and natural theology, showing the philosophical framework of the time. Volume 3 Catalogue maintenance uses source records and bibliographic context. All four volumes together give a complete picture of early 19th-century entomology.

What about non-insect arthropods? Are any of these books relevant?

Michelet's *The Insect* includes a long section on spiders, treating them as 'artisans' and using them to explore themes of labor and survival. While spiders are arachnids, not insects, the book's approach is similar to Fabre's. For strictly insect-focused works, stick with Fabre, Furneaux, or Kirby and Spence.

Conclusion & Scholarly Summary

From Fabre's intimate narratives to Kirby and Spence's systematic treatises, insect literature offers a rich spectrum of approaches. Beginners should start with the most accessible works—Fabre's essays and Furneaux's field guide—before progressing to the more technical monographs. Each book builds on the tradition of careful observation, whether in the field or the laboratory, and together they reveal the depth and diversity of insect life. The journey from wonder to expertise is itself a rewarding exploration.