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It is one of only two extant species in the hippopotamidae family, the other being its much larger cousin the common hippopotamus. The pygmy hippopotamus displays many terrestrial adaptations, but like its larger cousin, it is semi-aquatic and relies on proximity to water to keep its skin moisturized and its body temperature cool. Behaviors ...
West African hippopotamus or Tchad hippopotamus H. a. tschadensis – throughout Western Africa to, as the name suggests, Chad, slightly shorter and wider face, with prominent orbits Angola hippopotamus H. a. constrictus – in Angola , the southern Democratic Republic of Congo and Namibia , named for its deeper preorbital constriction
Hippopotamidae is a family of stout, naked-skinned, and semiaquatic artiodactyl mammals, possessing three-chambered stomachs and walking on four toes on each foot. While they resemble pigs physiologically, their closest living relatives are the cetaceans.
The arctic tundra often lacks sunshine. Summer days last 24 hours, yet the sun remains low on the horizon. During the winter, the opposite occurs, and the entire landscape is dark.
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Because they spend 40% of their lives in the snow, reindeer have developed several unique adaptations. To help them stand on snow and squishy ground, their split-in-two cloven hooves provide traction.