Amazing animals — A look at the weird and wonderful species that live on our planet

Marine otters live on rocky coasts with extreme swells and strong winds, with their dens built into crevices and caves.

Turuchan pikas play all sorts of games, including swinging from branches, throwing food around and hiding them jumping out at each other.

This bright green sea creature contains a toxic pigment that protects it from predators, kills bacteria and determines the sex of larvae, turning males into a "living testacle."

These leathery turtles spend most of their lives buried motionless in river mud, but burst into action to catch their unsuspecting prey.

This critically endangered animal, known for its long, thin snout with a bulbous growth at the end, split off from other crocodilian species 40 million years ago.

The northern sea robin is a strange-looking fish with legs that it uses to "taste" the seafloor.

Babirusas are believed to have diverged from their pig ancestors between 26 million and 12 million years ago after getting isolated on Sulawesi when sea levels rose at the end of the last ice age.

This little lizard can fire blood up to 5 feet from its face, has spiky horns and inflates itself to choke predators.

This living fossil can grow as large as an alligator, has two rows of needle-sharp teeth, and such strong armor that it survived predatory dinosaurs.

Siphonophores are unusual animals made up of individual organisms called "zooids," which each have a distinct function — despite being genetically identical.