When were the first land animals?

Land animals - first appeared on earth about 430 million years ago, but did not begin to resemble the ones we known today until 360 million years later. Sharks, however, were already abundant about 340 million years ago. It seems that the first land animals were insects such as scorpions and millipedes. But they were greatly different from today's insects. Next to develop were reptiles, the ancestors of lizards and crocodiles. About 180 million years ago the first mammals began to develop on land along with primitive birds. During this period the forerunners of apes began to appear. The earliest species lived both on the land and in the water. It took about 20 million  years for animals to develop the art of breathing air and so to live on land.

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