Hippos are aggressive and will attack humans.

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Honduran White Bats build and live in little tents made from plant leaves

Bears will clack their fangs when they are startled

Image of a black bear

Black Bears

Gentoo penguins propose to their mates by presenting them with the smoothest pebble they can find. If the female accepts, they use it to build their nest together and will mate for life.

Gentoo penguins propose to their mates by presenting them with the smoothest pebble they can find—they use it to build their nest together and will mate for life

Gorillas fart almost non-stop due to all of the fiber in their diet

Leaf-sheep slugs have the face of a sheep, a body of a leaf, and can photosynthesize