As in other mackerel sharks, the longfin mako is aplacental viviparous and typically gives birth to two pups at a time (one inside each uterus), though a 3.3-metre-long (11 ft) female pregnant with eight well-developed embryos was caught in the Mona Passage near Puerto Rico in January 1983.[1] The developing embryos are oophagous; once they deplete their supply of yolk, they sustain themselves by consuming large quantities of nonviable eggs ovulated by their mother. No evidence of sibling cannibalism is seen as in the sand tiger shark (Carcharias taurus).