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Bluehead wrasse males with yellow females of the species. If the blueheaded male is removed from a t
A colourful male guppy courting a female guppy: What are the influences of mate selection by female
Using adaptive equipment: (A) male putting on shoe; (B) female eating one handed.
Pelvis of male versus female
A Gaucher cell showing accumulated fat stored in structures called lysosomes
G-banded karyotype of a normal human male