These rare, prehistoric-looking sharks live in deep seas around the world and can grow up to 20 feet long. They catch prey using an eerie extending jaw motion, which you can see in action below.
These animals are even stranger than they look. The six-foot-long females display a stunning webbing between their tentacles, which trails behind them like a cape. But the males are only a few centimeters long (yes, you read that right). When the male finds a female he likes, one of his arms breaks off and crawls inside her to deposit sperm. Then he probably dies.
Pink fairy armadillo
These tiny armadillos, which look like furry beetles, are endemic to Argentina. They're less than five inches long and are excellent burrowers.
Narrow-headed softshell turtle
Growing up to 45 inches long, these unusual turtles are found in southern Asia. They bury themselves in sandy rivers and shoot their heads up to grab prey as it passes by.
Peacock mantis shrimp
These colorful shrimp are in a league of their own. Their protuberant eyes can see ten times more color than a human can, but the real punch is in their club-like attack arms, which they shoot at prey (or anyone they don't like) with the speed of a .22-caliber bullet. The water can actually boil in their wake. They're extremely belligerent and are difficult to keep in captivity because they can break right through an aquarium tank.
These cute rodents look like a cross between a deer and a rabbit. They live in Argentina and form monogamous pairs, and closely resemble their cousin the capybara.
These dragon-like snakes live in the tropics of sub-Saharan Africa and come in a stunning variety of colors. They're only around two feet in length but are quite venomous to humans.
Male hooded seals have sacs on their faces that they can inflate into large red balloons and then flail around as a sign of aggression. They're found in the north Atlantic and males measure around 9 feet long.
Found in Colombia and Ecuador, the males of this species have a long wattle - flesh hanging from their neck like those found on turkeys - that they can inflate for use in courtship.
These three-foot wide hermit crabs are the largest terrestrial invertebrates and are found near the Indian Ocean and parts of the Pacific. While babies live in shells like normal hermit crabs, adults grow out of them and develop a protective shell of their own. They can live 60 years or longer and are named for their love of coconuts, which they can deftly break open. They're often killed for their meat and have become increasingly rare in human-populated areas.
This crocodile looks like most others - except for his long, skinny snout. They're found in and around India and can grow to be 20 feet long.
Eastern long-necked turtle
These Australian turtles are half turtle, half snake. They use their necks, which they tuck sideways into their shells rather than withdrawing like most turtles, to quickly strike at passing prey.
The fossa is the largest predator on Madagascar and is a strange mix between a weasel and a cat. Growing up to six feet in length, including their tails, they're believed to have descended from a mongoose-like animal.
This animal's colloquial name is - you guessed it - the penis snake. The first living specimen was only discovered in the wild a few years ago in the Amazon and they're actually amphibians, not snakes.
These odd sea cucumbers may look rare but are actually extremely common. Just a few inches long, they're found on sea floors around the world.
Also known as the Sunda flying lemur, these big-eyed primates live in Southeast Asia and spend their time gliding between trees.
Almost too bright to be real, these toads are a member of the colorful Atelopus family and were just recently discovered in 2007 in Suriname, a small country in South America.
Perhaps the most shocking monkey out there, bald uakaris, also known as red uakaris, have a shaggy orange coat with a bright red bald head. They live near the Amazon River and their bright red appearance is due to capillaries beneath their skin.
These odd fish look more like coral than frogs - which is excellent camouflage. They have a very wide territory and use their arm-like fins to "walk" across the sea floor and hunt prey.
At less than 2 centimeters long, the pygmy seahorses' tiny size and incredible coloring helps them blend in with the coral they live near. In fact, their camouflage is so skillful that even scientists fell for it - most species have only been documented since 2000.
This odd mammalian insectivore is in a class all its own and diverged from other mammals an incredible 76 million years ago. It lives in Haiti and the Dominican Republic and injects its prey with toxic saliva. One of two remaining members of the solenodon family, a nocturnal, burrowing species, the Hispaniolan solenodon is endangered due to habitat loss and being hunted by pet cats and dogs.
CORRECTION: An earlier photo of the Honduran white bat was of a model, not the actual bat. The photo has been updated.