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When cats mate, the tomcat (male) bites the scruff of the female's neck as she assumes a positi
Male giraffe mounting a female. Only dominant males are generally able to mate.
Canvasback - female with ducklings
Eastern billabong fly (Austroagrion watsoni, female)
Comparison of (a) male and female skulls and (b) male and female pelves.
Common skin signs are often evidence of an illness or disorder. A scale is a thin, dry flake of ...