The dolphin is a marine mammal within the order Cetacea. There are 40 extant species of dolphin. Dolphins, alongside other cetaceans, belong to the order Cetartiodactyla, with even-toed ungulates. Their closest living relatives are the hippopotamuses, having diverged about 40 million years ago. The bottlenose dolphin, like the sketch here, inhabits warm waters worldwide. They […]

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