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Predators consume prey for energy. Predators that acquire prey and prey that avoid predation both increase their chances of survival and reproduction (i.e., fitness). Routine predator-prey interactions elicit mutual adaptations that improve predator offenses, such as claws, teeth, and speed, as well as prey defenses, including crypsis, aposematism, and mimicry. Thus, predator-prey interactions resemble an evolutionary arms race.
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The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle...
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How to Create and Use Binocular Rivalry
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The Visual-Predation Theory: A Binocular Look Backward.

Matt Cartmill1,2, Kaye Brown1

  • 1Department of Evolutionary Anthropology, Duke University, Durham, North Carolina, USA.

American Journal of Biological Anthropology
|January 10, 2026
PubMed
Summary
This summary is machine-generated.

The visual-predation theory remains the leading explanation for primate origins, despite ongoing debates. Further multidisciplinary research is needed to test its implications for early euprimate evolution.

Keywords:
arboreal theoryearly primateseuprimate originsprimate originsstem primatesvisual predation

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Area of Science:

  • Paleontology
  • Evolutionary Biology
  • Primate Origins

Background:

  • The appearance of the last common euprimate ancestor is generally agreed upon, resembling early primates like Teilhardina.
  • Debate persists regarding the adaptive significance of unique traits (synapomorphies) distinguishing early primates from other mammals.

Purpose of the Study:

  • To review the history and background of the visual-predation theory concerning primate origins.
  • To evaluate objections and alternative theories proposed since the theory's inception in 1970.
  • To assess the continued validity of the visual-predation theory for explaining euprimate synapomorphies.

Main Methods:

  • Literature review of the visual-predation theory and its historical context.
  • Critical evaluation of objections and alternative hypotheses.
  • Synthesis of evidence supporting or refuting the visual-predation theory.

Main Results:

  • The visual-predation theory, with modifications, is presented as the most robust explanation for the origin of euprimate traits.
  • Objections and alternative theories have been considered and evaluated against existing evidence.

Conclusions:

  • The visual-predation theory, when refined, offers the best current explanation for the evolutionary origins of key primate characteristics.
  • The theory's broader implications necessitate further comprehensive, multidisciplinary comparative research for validation.