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Male giraffe mounting a female. Only dominant males are generally able to mate.
Gorillas live in one-male or multimale groups, from which females emigrate at sexual materity.
Sexual swellings are one way for females to advertise their mating availability, thereby inducing ma
The “Flat Head” (Chinook) Indians acquired their name through shaping in infancy, as shown in a diag
A pedigree for a Y-linked trait. These traits are transmitted from males to all male offspring in ea