Where to start? The aye-aye is a kind of lemur, with large round ears that rotate independently. How does it eat? There are no woodpeckers in Madagascar, but the aye-aye has evolved to feed like one, using its long middle finger to scoop out grubs in tree bark.
See it in: Madagascar (and the Bristol Zoo Gardens).

Proboscis Monkey

The male proboscis monkey has a pendulous nose that is thought to amplify his calls to females (and his warnings to big-nosed rivals). The most dominant male usually has the biggest nose and can collect a harem of five to eight females.
See it in: Borneo (and the Singapore Zoo).

Emperor Tamarin

Named for the last emperor of Germany, this tamarin's wildly eccentric moustache (strikingly similar to Mr. Monopoly's) is something of a mystery. Experts think it might be a unique identifier, as a fingerprint is for humans.
See it in: Bolivia, Brazil, and Peru (and the Paignton Zoo, in Devon, England).

Matamata Turtle

The knobby, gnarled matamata uses its huge mouth to suck in unsuspecting food sources as they pass by. In Spanish, matamata means "it kills, it kills."
See it in: The Amazon River in Brazil, and in parts of Trinidad and Guyana (and the Honolulu Zoo and San Diego Zoo).

Gelada Baboon

This primate's fangy yawn is actually a display of aggression to show off its canine teeth. The red patch of skin on the female's chest gets brighter as her hormone levels increase. As a natural design feature, it's probably a little too much information.
See it in: Eritrea and Ethiopia (and the Bronx Zoo).

Echidna

The echidna is an evolutionary mashup - it has a pouch for its young like a kangaroo, spines like a porcupine, and a sticky tongue like an anteater. Oh, and it lays eggs like a chicken.
See it in: Tasmania, Australia, and New Guinea (and the Cleveland Metroparks Zoo, which has a short-beaked echidna).

Victoria Crowned Pigeon

These blue, turkey-size pigeons with outrageous plumage live mostly on the ground, mating for life and building sturdy nests for their young.
See it in: New Guinea (and the Philadelphia Zoo).

White-faced Saki Monkey

Often called flying monkeys, white-faced sakis rarely let their feet hit the ground. They prefer to stay in the mid-level trees of the rain forest, where they can jump up to 30 feet in a single bound and can run upright along narrow branches.
See it in: The rain forests of northeastern Brazil, French Guiana, Guyana, Suriname, and Venezuela (and the Elmwood Park Zoo in Norristown, Pa.).

Tree Pangolin

This insect eater's scales feel a little like human fingernails. But don't touch: Like the common skunk, the pangolin has an unpleasant-smelling spray for those who get too close.
See it in: Central Africa's rain forests (and the San Diego Zoo - which displays the tree pangolin infrequently, and without a lot of advance notice).

Leafy Sea Dragon

Male leafy sea dragons carry and give birth to the offspring. Instead of swimming upright, like sea horses, the leafy sea dragon swims in a horizontal position. It uses its tube-shaped mouth as a straw to suck up food.
See it in: The waters of the southeastern Indian Ocean, near southern and western Australia (and the Georgia Aquarium in Atlanta).