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Transcript of Mammals
Whales and Dolphins Seals Marsupials are best known for the Australian members of the family, the kangaroo, wallaby and the koala. they are different from other mammals because they have an abdominal pouch to carry their young. The marsupial female gives birth very early and the baby animal climbs from the mother's birth canal to her pouch. Here the baby marsupial continues to develop for weeks, or even months, depending on the species. Humans are part of the primate family.
Primates have several distinctive features that separate them from other mammals. Primates have well developed hands and feet, with fingers and toes. Their opposable thumb makes it easy for them to grab things.
Primate eyes are forward in the head giving them stereoscopic vision. This allows them to judge distance.
Primates also have large, highly developed brains. Their intelligence allows them to control and manipulate their environment. Their large brain also allows them to develop complex language and communication skills.
Although primates are born fully formed, they tend to have a long gestation period in their mother's womb.
Parents also care for and educate their young much longer than other animals. This results in a strong bond between a baby and the mother.
Primates are very social animals, and tend to form strong bonds with family and friends.
These mammals are named rodent, which means "gnawing animal," because of their large incisor teeth and the way they eat. The two long pairs of incisors are used like chisels to gnaw on hard foods like nuts and wood. These incisors must grow continuously since they are worn down by gnawing.
Since whales and dolphins are mammals, they cannot breathe under water. They must come to the surface to breathe air. They breathe through a blowhole, or nostrils, on the top of their head.
Babies are born under water and must be pushed to the surface, by the mother, so that they can take a breath.
Whales and dolphins also look different from many other mammals because they don't have fur. Although, they do have a sparse covering of hair.
The circulatory and respiratory systems have adapted to living in water. Whales and dolphins can dive deep in the water on a single breath.
Whales and dolphins also have a highly developed brain. They are consider to be very intelligent.
Dolphins, and some whales, can use echolocation to find food and identify objects around them. They make loud clicking and squeaking sounds that bounce off objects and echo back to the dolphin. This echo tells the dolphin about the nearby object.
The seals are marine mammals. The seal family includes the seal, sea lion and the walrus.
Baby seals are born on land after a long, 12 month gestation period. The pups develop rapidly, with some able to swim within a few hours of birth.
Walruses differ from seals in that they are larger and have large tusks.