Baby sharks are known as "pups." Already equipped with a set of teeth and ready for life on their own, baby sharks leave their mother immediately after birth.
Sharks have one of the longest gestation periods of all mammals, with the basking and frilled sharks carrying their young for up to 3 or 3.5 years. Litter size ranges from a single pup or two in great whites, to more than 100 among the whale and blue sharks. Eggs hatching inside the female shark may be fed by a placenta (viviparity), without a placenta (Aplacental viviparity), or deposited into the ocean where they hatch on their own (oviparity).