Vampire Bat (Desmodus rotundus), portrait, Costa Rica
Vampire Bat: Native to Mexico, Central America and South America, this creature's only source of food is blood. Thermo receptors on the bat's nose help it to detect prey.
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Portrait of Reef Lizardfish, Synodus variegatus, Cabilao Island, Visayas Islands, Philippines
Reef Lizardfish: This creature's colorful exterior helps it remain camouflaged from its prey. The fish perches underwater on rocks and coral and in sand while waiting to attack.
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The Chinese Crested and Chihuahua mix
Chinese Crested and Chihuahua Mix: This pup (named "Elwood") weighs in at just 6 pounds and was rescued as the result of a New Jersey SPCA investigation. He won the title of World's Ugliest Dog of 2007.
Ben Margot/AP Photo
Tasmanian Devil: Today, this marsupial is found only on the island of Tasmania in Australia. Its large head and neck allow it to have one of the strongest bites per body mass index of any land predator.
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Three-Toed Sloth: Unlike many other land animals, this mammal doesn't maintain a constant body temperature, which limits it to living in warmer environments. The three-toed sloth calls Central America and South America home.
California Condor (Gymnogyps californianus)
California Condor: A critically endangered species, this bird is native to California. It's the largest North American land bird and one of the longest living birds, with a lifespan of up to 60 years.
Tarsier: Extremely shy animals that live in South Asia, this primate has hard-to-miss eyes that typically measure 16 mm in diameter, larger than its entire brain.
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Blobfish: Living deep in the waters of Tasmania and Australia, the blobfish is rarely seen by humans. Its gelatinous body and lack of muscle help it to keep a density that's slightly less than that of water, allowing it to float just above the sea floor without using much energy.
Caters News Agency
King Vulture: One of the largest vultures in the world, this bird makes its home in Central America and South America. The hooked tip and sharp bill of its beak often make it the first scavenger to cut into a carcass.
Peter Orr/Getty Images
Deep Sea Anglerfish
Deep Sea Anglerfish: A fleshy growth, or lure, projects from this fish's head and attracts prey. When touched, it triggers the anglerfish's teeth to attack.
Alligator Snapping Turtle
Alligator Snapping Turtle: The largest freshwater turtle in North America, it's mainly found in the southern United States. Its spikes and raised plates resemble primitive dinosaur characteristics and distinguish it from other snapping turtles.
Elliott Minor/AP Photo
Bactrian Camel: Native to central Asia, it's one of the two surviving species of camels today. This creature regularly eats snow to take care of its water needs, which makes it more adaptable to different environments. Out of the 200 million living today, most are domesticated.
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Red-Lipped Batfish: Found in the Galapagos Islands, these red-lipped fish are not known for their swimming abilities. Instead, they use their pectoral fins to "walk" on the sea floor.
Florida Soft-Shelled Turtle
Florida Soft-Shelled Turtle: One of the fastest turtles, it has a long, snorkel-like nose that allows it to live an almost entirely aquatic existence in the still waters of Florida and other parts of the southern United States.
Deep Sea Barracuda
Deep Sea Barracuda: A salt water dweller, this fish is known for its short bursts of speed (which can reach 27 mph) to reach prey.
Jeff Rotman/Getty Images
Matamata: A freshwater turtle from South America, it has a shell and head that resemble tree bark and leaves. As the turtle floats, its skin helps to disguise it as vegetation until other fish are close enough to be captured.
Martin Harvey/Getty Images
Flying Foxes: The largest of its species, this fruit bat is found in forests and swamps near coastal areas in Africa, Southeast Asia, Australia and the Pacific & Indian islands. They are clumsy in landing and often have to crash into bushes or trees to come to a stop.
Tim Flach/AFP/Getty Images
Wuru' the Dugong
Wuru' the Dugong: This large marine mammal is shown in the Mermaid Lagoon exhibit at Sydney Aquarium on Dec. 19, 2008. It is believed that mermaid myths were born from pirates and sailors sighting dugongs.
Torsten Blackwood/AFP/Getty Images
Baird's Tapir: A large browsing animal (similar to a pig), this inhabitant of Central America, South America and Asia often raises its snout and shows its teeth to detect smell.
Martin Harvey/Getty Images
Golden Snub Nose Monkey
Golden Snub Nose Monkey: Native to the mountainous regions of China, these primates have golden hair that helps scientists determine age and gender. Young monkeys have brown hair, while adult males have longer, thicker hair than females.
12-day-old Little Lorikeets: With special brush-like tongues for collecting nectar, these small- to medium-sized parrots are mostly found in Australia.
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Frill Shark: This creature usually lives in water 600 meters deep or more. Its body shape and number of gills are similar to those of fossils of sharks that lived 350 million years ago.
Awashima Marine Park/Getty Images
Wolf Spider: With eight eyes arranged in three rows, these spiders rely on their excellent eyesight to hunt prey.
Cyril Ruoso/JH Editorial/Getty Images
Komodo Dragon: The largest living of its species, this lizard lives in the island region of Indonesia, including Komodo Island, and dominates the ecosystems where it lives, as it can measure up to 10 feet in length and weigh up to 150 pounds.
Aye-Aye: With rodent-like teeth and a long middle finger used to drill into tree trunks for food, this lemur is native to Madagascar and is the world's largest nocturnal primate.
Rob Cousins/Bristol Zoo via Getty Images
Vundu catfish: Capable of reaching over 5 feet in length, this fish (held by Jeremy Wade) can reach a maximum known weight of 121 pounds.
Courtesy Animal Planet
A featherless, genetically engineered chicken
A Featherless, Genetically Engineered Chicken: In 2002, scientists at the Hebrew University of Jerusalem's Department of Agriculture in Israel released photos of their 'The Naked Chicken," a low-calorie (the lack of feathers means there's less fat) and faster maturing bird.