Example image of eyePlorer eyePlorer map for 'Vestigiality': Evolution Function (biology) Homology (biology) Organism Phenotypic trait Anatomy Behavior Biochemistry Embryogenesis Organ (anatomy) Genetic variation Exaptation Emu Ostrich Penguin Fitness (biology) Mutation Darwinism Aristotle History of Animals Jean-Baptiste Lamarck Philosophie Zoologique Étienne Geoffroy Saint-Hilaire Blind mole rat Guillaume-Antoine Olivier Charles Darwin Androgenic hair Coccyx Human eye Intrinsic muscles of external ear Nictitating membrane The Descent of Man, and Selection in Relation to Sex Third molar Vermiform appendix On the Origin of Species Inheritance of acquired characters Robert Wiedersheim Scopes Trial Cancer Infection Natural selection Horse Toe Common descent Douglas J. Futuyma English language Latin Old Norse Adaptation Animal