Hippopotamuses are known to kill hundreds of people per year. 

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Glass frogs have transparent abdominal skin that make the heart, liver, and digestive tract visible

Image of a polar bear lying down

The Polar Bear

Bloody-Belly Comb Jellies are almost invisible to predators because its hard to see red in deep water

Giraffes have a unique conflict resolution known as “necking”

The Mexican or Brazilian free-tailed bat, can reach speeds of 100 mph (160 km/h) and can fly at an altitude of 10,800 ft (3,300 m) 

close up photography of penguin on snow

The Penguin