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Survival of the Fittest

Sand tiger shark “eggs hatch in the uterine chamber when the embryos are about 17 cm (6.7 in) in length. The largest and most advanced embryo in each chamber (usually the first hatched) kills and consumes younger developing siblings (intrauterine cannibalism). After preying on their siblings, the two remaining embryos feed on any eggs present. After a gestation period of eight to nine months, two pups are born, one from each uterine chamber” (Aquarium of the Pacific).

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