Why were Kangaroos Found Only in Australia?

Nobody knew kangaroos existed until about 200 years ago. Australian explores and settlers saw them then for the first time. The kangaroo, of course, has a pouch, and in Australia and its neighbouring islands are were most of the pouches.

Pouched animals have been found. Pouched animals from the order of mammals called “the marsupials”.  this name comes from the Latin word marsupium, which mean “pouch”. the first mammals appeared more than 100,000,000 years ago, during the Age of Dinosaurs.

Some of these were marsupial, and some were “placental”. A placental mammal supplies food to the unborn young within the the mother’s body. In marsupial mammals, the pouch serves this purpose.

The young are born very tiny and develop in the mother’s pouch. When the earth’s climate changed, the dinosaurs died out. The mammals of the earth. But the placental mammals were more successful than the marsupials.

Their brains were superior, and it was also better for the young to develop inside the mother’s body than in a pouch. In most parts of the world the marsupials disappeared. They could not complete for living places with the other mammals. But this did not happen in Australia and South America. Scientists believe that Australia was once linked to South-Eastern Asia.

This may have been with a chain of islands or an isthmus. So marsupials spread into Australia at a time when there were no advanced placental mammals there. They did not have any competition, so they flourished and evolved in many forms. 

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