Copulation and Gestation in the Pocket Gopher

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Abstract
Two separate breedings were observed in the pocket gopher, Thomomys bottae, of the San Francisco Bay region of California. Copulatory behavior is described in detail and is a relatively lengthy procedure involving numerous periods of intromission. Gestation periods were nearly 19 days in two instances. Both females showed external and histologic evidence of heat at the time of copulation. One parturition was observed. Labor movements consisted of a swelling and forward bulging of the dorso-lateral walls of the abdomen. The female did not assist the delivery except by these movements.