The group of water or aquatic mammals is very rich and diverse. It includes multiple species of animals dwelling either in oceans or in fresh water. They often differ drastically in looks, features, and size. Some of them, for example, whales – the largest mammals ever, sea cows, and dolphins, live entirely in the water and cannot reside on land. Nonetheless, it is interesting to note that their ancestors did dwell on land long before they evolved into these primarily ocean-dwelling creatures...
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