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Some male birds and mammals congregate in communal courting grounds called leks.
A male Lestes dryas in the "spread-winged" posture that gives the family its common name
Common sites of amputation. (A) Upper extremities. (B) Lower extremities. The surgeon determines th
Adapoids and omomyoids had longer snouts and are the first “true” primates.
Normal karyotype of a human male