Shy creatures who reside in extensive burrows, groundhogs keep to themselves and might go unnoticed in your own backyard.

Combine a bulbous snout with a prominent jaw, a body like a beer keg set on four stubby legs, and you have a hippopotamus.

Members of the weasel family, otters are known for their elongated bodies, webbed feet and playful antics, particularly their love of sliding down rocks, banks or waterfalls.