 It gives birth to two pups at a time (rarely just one), one per uterus.With no defined breeding season, most adult females are pregnant throughout the year; the gestation period is uncertain, but has been suggested to be less than one year as in the common thresher.The developing embryos are sustained by a yolk sac until they are 12 cm (4.7 in) long, after which they are oophagous and feed on egg capsules produced by the mother.