Top 10 Most Bizarre and Strangest Animals on Earth

It has a duck's bill, a beaver's tail and otter's feet. It lays eggs, secretes milk through the skin on its belly, and the male has venomous spurs on its hind legs.

The 'unicorn of the ocean'. The male's gigantic spiral tusk is actually an ever-growing canine tooth full of nerve endings that can grow up to three meters long.

The only mammal in the world with armor of hard keratin scales. When threatened, it rolls up into an impenetrable ball that even lions can't crack.

A prehistoric-looking bird from the African swamps with a massive clog-shaped bill that sounds like a rattling machine gun when it clatters.

Not only can it fully regenerate lost limbs and tails, it even repairs damaged parts of its own heart and brain without scar tissue.

A nocturnal lemur from Madagascar with bat ears, rodent teeth and one creepily long, thin middle finger it uses to tap larvae out of tree bark.

The smallest armadillo in the world is barely 10 centimeters long, has a pink shell and silky white hair, and literally 'swims' through the sand.

Virtually immune to cancer, barely feels pain, can survive 18 minutes without oxygen and lives in an ant-colony-like structure led by one queen.

A tiny sea slug that floats upside down on the water's surface, eats venomous jellyfish and reuses their stinging cells for its own defense.

Lives thousands of meters deep and flutters cutely through the dark water with two ear-like fins that look just like Disney's flying elephant.