Why Do Animals Keep Evolving Into Anteaters?
Why Read This
What Makes This Article Worth Your Time
Summary
What This Article Is About
Helen Pilcher examines a remarkable evolutionary pattern: mammals have independently evolved into anteaters 12 separate times since the dinosaur extinction 66 million years ago. This convergent evolutionβwhere unrelated species develop similar traitsβincludes South American anteaters, African pangolins and aardvarks, and Australian echidnas, all practicing myrmecophagy (ant and termite consumption). A study in Evolution by Thomas Vida reveals how this abundant food sourceβwith ant and termite biomass exceeding wild mammals by tenfoldβcreates powerful selective pressure favoring long sticky tongues, reduced teeth, and strong forelimbs across marsupials, placental mammals, and monotremes.
The article explores competing evolutionary theories through this lens. Simon Conway Morris uses convergent evolution to argue for deterministic, predictable evolutionβ”rewind the tape of life” and similar forms emerge. However, Stephen Jay Gould emphasizes random events and “sliding doors” moments that derail trajectories unpredictably. Pilcher concludes that while 12 independent evolutions suggest pattern, far more mammals haven’t become anteaters, and evolution’s quirky nature means humanity’s anteater future remains unlikely. Yet these sustainable huntersβwho leave colonies intact to rebuildβoffer valuable lessons even if we can’t evolve into them.
Key Points
Main Takeaways
Twelve Independent Evolutions
Since dinosaur extinction, mammals evolved into anteaters 12 separate times across continents, including marsupials, placental mammals, and egg-laying monotremes.
Abundant Food Source Drives Evolution
Fifteen thousand ant and termite species with collective biomass exceeding wild mammals by tenfold create powerful selective pressure for specialized feeding adaptations.
Convergent Evolution Patterns
Unrelated species independently develop similar traitsβlong sticky tongues, reduced teeth, strong forelimbsβwhen facing identical ecological challenges like accessing insect colonies.
Determinism Versus Randomness Debate
Conway Morris argues evolution is predictable and deterministic, while Gould emphasizes random events and “sliding doors” moments that unpredictably alter evolutionary trajectories.
Multiple Convergence Examples
Echolocation evolved separately in bats and dolphins; camera eyes in octopuses and vertebrates; powered flight independently four times; venom production over 100 times.
Sustainability Lesson
Anteaters practice sustainable harvesting by leaving some insects behind for colony regenerationβoffering behavioral insights even if humans don’t evolve similar traits.
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Article Analysis
Breaking Down the Elements
Main Idea
Convergent Evolution as Evolutionary Debate Proxy
Uses anteater evolution as evidence in fundamental debate between evolutionary determinism and randomness. Presents 12 independent evolutions toward myrmecophagy seemingly supporting Conway Morris’s deterministic viewβsimilar environmental pressures produce predictable outcomes. However, ultimately argues pattern doesn’t guarantee future repetition, endorsing Gould’s emphasis on contingency and unpredictable “sliding doors” moments. Anteater example becomes teaching tool demonstrating striking evolutionary patterns don’t resolve whether life’s history follows inevitable trajectories or depends critically on chance events that could have unfolded differently.
Purpose
Public Science Engagement Through Whimsy
Makes sophisticated evolutionary biology accessible through humor and cultural referencesβDalΓ walking anteaters, speculating human anteater futures, invoking “crabby memes.” Purpose extends beyond entertainment: translates technical concepts (selective pressure, convergent evolution, ecological niches) into digestible explanations preserving intellectual rigor. Playful tone disarms readers before introducing complex theoretical disputes between Conway Morris and Gould. Ending with anteaters’ sustainable harvesting connects abstract evolutionary theory to contemporary resource management concerns, demonstrating understanding biological patterns offers practical wisdom regardless whether humans evolve similar traits.
Structure
Narrative Hook β Scientific Explanation β Theoretical Debate β Philosophical Resolution
Opens with affectionate anteater descriptions and DalΓ’s Parisian walk, establishing charm before introducing Vida’s Evolution study. Systematically explains convergent evolution mechanics: abundant food creates selective pressure, advantageous traits propagate, similar solutions emerge independently across mammalian groups. Broadens scope with parallel convergence examples (echolocation, flight, venom) before pivoting to theoretical implicationsβConway Morris’s determinism versus Gould’s contingency. Deliberately moves from concrete (anteater tongues) to abstract (evolutionary predictability) before returning to practical wisdom (sustainable harvesting), making philosophical debates tangible through biological specifics while maintaining accessible progression from observation through theory to application.
Tone
Playful, Erudite & Conversationally Philosophical
Adopts distinctly British popular science toneβwitty, self-aware, intellectually serious without solemnity. Rhetorical questions (“Who doesn’t love an anteater?”) invite reader participation, while cultural touchstones (DalΓ, “cheese dream,” “sliding doors”) create shared reference points. Scientific vocabulary appears naturally integrated rather than didactically defined, trusting readers following context. Balances wonder at evolutionary phenomena with philosophical humility about knowledge limits. Phrases like “fly in ointment” and “evolution pulls rug” employ colloquialisms making abstract concepts tangible. Accessibility never condescendsβrespects audience intelligence while ensuring complex theoretical debates remain graspable, creating conversational intimacy around sophisticated scientific discourse.
Key Terms
Vocabulary from the Article
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Tough Words
Challenging Vocabulary
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The specialized feeding behavior of consuming ants and termites; practiced by diverse mammals including anteaters, pangolins, aardvarks, and echidnas across multiple continents.
“Different animals, on different continents, that all practise myrmecophagy, also known as the consumption of termites and ants.”
The evolutionary phenomenon where crustaceans independently evolve a crab-like body plan multiple times; has occurred at least five times, spawning internet memes about evolutionary inevitability.
“Crustaceans have evolved the classic, crab-like body plan at least five times. Known as carcinisation, it has spawned crabby memes aplenty.”
The biological ability to determine object locations by emitting sounds and interpreting reflected echoes; evolved independently in bats and dolphins through convergent evolution.
“Convergent evolution is how echolocation (the ability to determine the location of objects using reflected sound) evolved separately in bats and dolphins.”
Required or necessary for a particular purpose or situation; essential elements that must be present for something to occur or function properly.
“In theory, with enough time, the appearance and retention of the requisite genetic mutations… some mammals could evolve gummy mouths and sticky tongues.”
The highest point of development or achievement; the peak or culmination representing the ultimate expression or goal of a process or system.
“We’re wrong to presume that because myrmecophagy has evolved multiple times, it is the pinnacle of some evolutionary tree.”
A perfect example or embodiment of a particular quality or type; the ideal representation that fully captures the essence of something.
“Anteaters don’t typically eat all of the ants or termites in a nest… This makes them the epitome of sustainable living.”
Reading Comprehension
Test Your Understanding
5 questions covering different RC question types
1According to the article, the collective biomass of ants and termites exceeds that of all wild mammals by more than ten times.
2What does Simon Conway Morris use convergent evolution to argue?
3Which sentence best explains the mechanism by which selective pressure leads to evolutionary change?
4Evaluate these statements about convergent evolution examples provided in the article:
Powered flight evolved independently at least four times across different animal groups including birds, bats, pterosaurs, and insects.
Carcinisation refers to the phenomenon where mammals repeatedly evolved crab-like body plans.
Camera-like eyes evolved separately in both octopuses and vertebrates through convergent evolution.
Select True or False for all three statements, then click “Check Answers”
5Based on Pilcher’s discussion of Gould’s “sliding doors” moments and random events, what can be inferred about why humans are unlikely to evolve into anteaters?
FAQ
Frequently Asked Questions
The article identifies marsupials (like kangaroos), placental mammals (like humans and most familiar mammals), and egg-laying monotremes (platypuses and echidnas) as the three major mammalian groups. Their convergence toward anteater characteristics is particularly significant because these lineages diverged very early in mammalian evolutionary historyβthey represent fundamentally different reproductive strategies and evolutionary paths. That all three independently evolved similar feeding adaptations demonstrates how powerful selective pressure can overcome deep phylogenetic differences, producing superficial similarity despite minimal genetic relatedness and radically different ancestral body plans.
This metaphor frames a fundamental question: if evolution could be “played again” from identical starting conditions, would it produce similar or radically different outcomes? Conway Morris argues convergent evolution demonstrates determinismβsimilar environmental challenges would reliably generate similar solutions, yielding recognizable lifeforms. Gould counters that random events fundamentally alter evolutionary trajectories, meaning replaying life’s tape would produce entirely different results because unpredictable contingenciesβasteroid impacts, climate shifts, chance mutationsβcritically determine which lineages survive and diversify. The metaphor encapsulates whether evolution follows predictable laws like physics or depends on historical accident and path-dependent contingency.
Anteaters and aardvarks don’t consume entire ant or termite colonies but deliberately leave survivors to rebuild populations, ensuring continued food availability. This represents sustainable resource managementβharvesting within regenerative capacity rather than exploiting to depletion. Pilcher suggests that even if humans don’t evolve anteater biology, we can learn from their behavioral strategy. The implication extends beyond literal insect consumption to broader ecological wisdom: species that practice restraint and allow resource renewal maintain long-term survival advantages. This evolutionary adaptation offers practical guidance for sustainable human resource use and conservation practices.
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This article is classified as Advanced level due to its engagement with sophisticated theoretical debates in evolutionary biology, requiring readers to understand and evaluate competing philosophical frameworks (determinism versus contingency). The writing assumes familiarity with evolutionary conceptsβselective pressure, adaptive traits, phylogenetic relationshipsβwhile introducing specialized terminology like myrmecophagy and carcinisation. Successfully comprehending the article requires tracking nuanced arguments about predictability in biological systems, distinguishing between Conway Morris’s and Gould’s positions, and recognizing how anecdotal evidence (12 convergent evolutions) can support multiple interpretations. The playful tone masks conceptual complexity demanding critical thinking about causation, probability, and historical contingency in natural systems.
DalΓ’s Parisian anteater walk serves multiple rhetorical functions beyond whimsy. It establishes anteaters’ cultural significance and charismatic appeal, legitimizing the article’s extended discussion of these specialized creatures. The surrealist artist connection subtly parallels the article’s own structureβusing unexpected juxtapositions (evolutionary biology meets pop culture) to illuminate deeper truths. The anecdote’s verifiable reality (“there is photographic evidence”) also models the article’s approach to scientific claimsβdistinguishing documented facts from speculation. Most importantly, it humanizes the subject matter, creating emotional investment before technical discussion begins, demonstrating effective science communication strategy that hooks readers through cultural touchstones before introducing complex theoretical frameworks.
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