Every year on February 15, World Hippopotamus Day, sometimes referred to as World Hippo Day, is observed. The day is set aside specifically to honor hippopotamuses and to inspire action against their extinction.The hippopotamus is the largest terrestrial mammal after elephants and rhinos.
The closest surviving relatives of hippopotamids, despite their outward resemblance to pigs, are whales, dolphins, porpoises, etc., from whom they diverged some 55 million years ago. Native to sub-Saharan Africa, hippos are semi-aquatic mammals that like to live in rivers and mangrove swamps.
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