As we all know, animals on land need to sleep, although their sleeping postures and methods are different. So, do animals in the ocean also sleep? The answer is yes, they also sleep, and their sleeping postures and methods are even more special. In fact, sleep is just a s...
Antarctica has plenty of sea ice and abundant food sources, but polar bears have nowhere to go. Arctic and Antarctic habitats have many similarities, but the creatures that inhabit them are very different. Both polar regions are home to seals and whales, but only the Nort...
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