Feathers are one of evolution's cleverest inventions
Feathers are held up as a striking example of evolutionary engineering, enabling feats like multi‑day nonstop bird migrations, silent owl flight and extreme insulation, which prompts comparisons with human-made aeronautics. Commenters dive into how such complex structures and related traits (like directional hair and nail growth, or bird respiration) could arise gradually through natural selection, contrasting this with arguments for intelligent design and questions about whether evolution implies “cleverness” or agency. The exchange broadens into reflections on how evolution operates as a non-teleological but powerful optimizer, the limits of popular explanations, and what counts as an “invention” in nature.
Accessing the article
- Several comments share archive.is and Wayback Machine links, plus bookmarklet snippets to quickly open archived versions of any page.
- People appreciate the convenience and describe different use cases: archives when a page won’t load, Wayback for version comparisons.
Feathers, flight, and evolution
- Readers praise the article’s breakdown of feather structures and functions, and extend it with notes on owls’ silent flight and penguin-inspired swimsuits.
- Discussion of birds vs other flying vertebrates: comparisons to bats, pterosaurs, flying squirrels, and insects (dragonflies, flies, etc.), including four-wing vs two-wing tradeoffs and wingtip inefficiencies.
- Origin of feathers: insulation, communication, and water-repellency are mentioned as plausible pre-flight functions; multiple competing hypotheses for the origin of avian flight are linked, with no consensus.
Hair, nails, and developmental mysteries
- Several threads dive into how hair and nails grow directionally and to specific lengths, and why some skin areas don’t grow hair.
- Explanations center on growth cycles (anagen phases), timed growth vs length-sensing, follicle miniaturization, mechanotransduction, and environmental factors like shoe pressure.
- Ingrown toenails and trimming techniques are discussed, with disagreement about mechanisms and best prevention strategies.
Bird physiology and extreme flight
- The Bar-tailed Godwit’s nonstop 8,000+ mile migration draws attention; some note the article understates aircraft ranges.
- Debate over whether godwits mostly flap continuously or must also exploit winds/updrafts; one side insists they’re pure flappers with high wing loading, the other argues energy math implies environmental assistance.
- Bird respiratory systems are compared to “flow-through” designs; birds and dolphins’ unihemispheric sleep is mentioned as enabling long activity.
Evolution, “design,” and language
- Large subthread on whether evolution is “random,” “clever,” or implies a designer.
- Some emphasize random mutation but non-random selection; others argue teleological language (“invention,” “optimized,” “designed”) is misleading or tacitly theistic.
- Creationist arguments question the probabilistic plausibility of complex organs, abiogenesis, and rapid evolution (e.g., chimp-to-human timescales); others rebut that such views misunderstand evolutionary dynamics.
- Meta-debate on whether evolution is “science at its finest” or better seen as emergent, unsystematic trial-and-error.
Semantics and philosophy
- Arguments about whether feathers are “inventions,” “discoveries,” or emergent phenomena; suggestions include using “emergence” for non-intentional complexity.
- Some criticize anthropomorphizing evolution; others defend such language as a useful modeling shortcut.