When they feel the time is right, some seals will dig nests in the sand on which to have their young. Others, like the harp seal, will have their babies directly on icebergs.Baby seals, called pups, will stay on land until their waterproof fur grows in. Females will mate and become pregnant again as soon as her pups are weaned.There are 16 species of eared seals; seven of them are sea lion species. Harp, ringed, hooded, spotted, bearded and ribbon seals live in the Arctic.One of the most recognized species, according to the NOAA, is the California sea lion, which is often featured doing tricks at zoos and aquariums. Crabeater, Weddell, leopard and Ross seals live in the Antarctic.Seals and sea lions are semiaquatic mammals that are in a group called pinnipeds, meaning "fin-footed." Walruses are also members of this group.
They sometimes skip eating for a few days, and often stop eating completely during mating season and will live off energy from their stored-up blubber for weeks.
The Caribbean monk seal was declared extinct in 2008.
The crabeater seal has the largest population of any species of seal in the world.
Some local populations, such as gray seals in the Baltic Sea, are endangered.
The northern fur seal and hooded seal are vulnerable.