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Duck-billed platypus – Biology and Evolution

By |2017-05-26T16:14:18-07:00May 26th, 2017|Biology|

Duck-billed platypus swimming Probably the very first mammals that evolved from reptiles about 200 million years ago were small animals covered with fur that still laid eggs like reptiles, but their babies got milk from their mothers like mammals. Most of the mammals like this have died out now, but one survivor is [...]

How do Opossums carry their babies? Biology

By |2018-04-16T08:12:58-07:00May 26th, 2017|Biology|

Opossum The earliest mammals, about 200 million years ago, hatched from eggs and then got milk from their mothers, like the duck-billed platypus. But soon after that, about 125 million years ago, these mammals evolved into mammals that were born alive, but helpless and tiny. These tiny babies then lived in a pouch [...]

What are Mammals – Biology

By |2018-04-21T11:56:43-07:00May 26th, 2017|Biology|

Rat from New Zealand About 200 million years ago, when all the land on Earth was stuck together in one big continent called Pangaea, some animals related to reptiles living on Pangaea gradually evolved into a new group called mammals (MAMM-elz). The mammals were different from the earlier reptiles in several ways. First, [...]

Evolution of Horses – Where do horses come from?

By |2017-09-16T22:18:43-07:00May 26th, 2017|Biology, Central Asia|

Eohippus - an early kind of horse When mammals first began to grow larger, after the dinosaurs became extinct about 70 million years ago, some of them evolved into the earliest ancestors of horses. The first horses evolved in North America. They were about the size of dogs. They had three toes, lived [...]

Chimpanzee Evolution and Biology

By |2018-09-03T10:22:42-07:00May 26th, 2017|Africa, Biology|

What is a chimpanzee? Chimpanzees evolved in the Tertiary period, about five million years ago, when they split off from earlier primates in Africa. When did chimpanzees evolve? Chimpanzees are descended from earlier primates. They probably split off from the branch that became modern humans about five million years ago, but they're still [...]