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Female leopard in the Sabi Sands area of South Africa. Note the white spot on its tail, used for com
Male South American Knob-billed Duck (S. m. sylvicola)
Female A. australis, the only Australian representative of Aythyinae
Successful male musical groups may owe some of their popularity among preteen girls to adrenarche.
Hormonal control of the male reproductive hormones.
The karyotype of an XYY male. Affected individuals are usually taller than normal, and some, but not