Seals can be found in all waters of the world, from the Arctic and Antarctic to tropical waters. Seals are divided in two families: one that includes seals with ears, like sea lion, and other that includes earless seals, like common seal. There are 33 species of seals in total. Seals are related to dogs, bears and cats. They are more closely related to dogs, as are dolphins, and can catch distemper.
Seals have an excellent sense of smell, allowing them to detect predators. Females also use their smell to recognize their pups. Seals hear very well both above and below water. Females and pups often call to each other. Seals are mammals. They’re warm-blooded, give live birth, nurse their young, breathe air, and have hair. Since they live in the marine environment and find their food at sea, they are called marine mammals. Other marine mammals include whales and sea otters.
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Seals are carnivores. Their diet consists mostly of fish, crustaceans and shellfish. Depending on the season or availability, they will feed on different prey. Seals are able to hold their breath for a long times during dives, using oxygen stored in the blood and muscles as well as the lungs. They can sleep underwater, and even surface to breathe without awakening. If they reach adulthood, seals can live up to 30 years.