Breeding occurs in late winter and early spring (Banfield 1974; Chapman and Feldhamer 1982). Females are considered sexually mature at 2 years of age, but do not necessarily breed upon first reaching maturity. Some evidence suggests that females do not breed every year (Melquist and Hornocker 1983; Dronkert-Egnew 1991). Males mature at approximately 2 years of age, but may not successfully breed until they are 5-7 years old (Chapman and Feldhamer 1982). Copulation occurs in water.
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