1. Devils Hole pupfish: The Devils Hole pupfish is the rarest fish in the world. It's found only in Devils Hole, a water-filled cavern in Death Valley National Park in Nevada.
2. Komodo dragon: The Komodo dragon is the largest, heaviest lizard in the world—and one of the few with a venomous bite.
3. Western diamondback rattlesnake: Endemic to the southwestern United States and Mexico.
4. Kemp's ridley sea turtle: Listed as Critically Endangered by the IUCN, Kemp's ridley sea turtle is the rarest species of sea turtle in the world.
5. Giant oceanic manta ray: The largest ray species, and one of the largest fish in the world, the majestic giant oceanic manta ray enjoys a global range in tropical and temperate waters.
6. Panther chameleon: A showstopping superstar, the panther chameleon is one of the most colorful of all chameleons.
7. Coconut crab: The largest terrestrial arthropod in the world, the mighty coconut crab is a huge land-dwelling crustacean with a taste for carrion, hence its nickname the "robber crab."
8. Saltwater crocodile: This fearsome beast native to Southeast Asia, northern Australia, and Micronesia is the world's largest living reptile.
9. Bulldog ant: This is the most dangerous ant species in the world, a fact acknowledged by Guinness World Records.
10. Golden poison frog: Despite its diminutive size, the golden poison frog is likely the most toxic animal on the planet.