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A colourful male guppy courting a female guppy: What are the influences of mate selection by female
When cats mate, the tomcat (male) bites the scruff of the female's neck as she assumes a positi
Male mandarin duck flying in Dublin, Ireland
Hormonal control of the male reproductive hormones
These photos show a rat burying a test object from which it has just received a single mild shock.
Stacking the joints. A. Correct thumb–wrist alignment for applying direct pressure. B. Incorrect ...