Whales and dolphins can literally fall half asleep. Their brain hemispheres alternate sleeping, so the animals can continue to surface and breathe.

Tigers have striped skin, not just striped fur.

The world's largest rodent is the capybara. An Amazon water hog that looks like a guinea pig, it can weigh more than 100 pounds.

The world's smallest mammal is the bumblebee bat of Thailand, weighing less than a penny.

The world record frog jump is 33 feet 5.5 inches over the course of three consecutive leaps, achieved in May 1977 by a South African sharp-nosed frog called Santjie.

The poison-arrow frog has enough poison to kill about 2,200 people.

The hummingbird, the loon, the swift, the kingfisher, and the grebe are all birds that cannot walk. — Compiled by The Surfer i