Goliath frog

Tipping the scales at more than 7 pounds, the Goliath is the largest frog in the world. Just two of these frogs weigh as much as a bowling ball. Because this slimy amphibian is so heavy, it can't jump very high. When it's hungry, it hides in marshes and wetlands and waits for insects, newts, and fish. People have been known to pay more than $3,000 for this endangered amphibian.

Scientific name: Conraua goliath
Size: 13 inches long Weight: up to 8 pounds
Diet: insects, crustaceans, and other small frogs
Habitat: rivers and rain forests of Cameroon, Equatorial Guinea, and western Africa
Characteristics: green with big mouth; world's largest frog
Threats: habitat destruction, overhunting, and capture for pet trade

Image credits: main image: courtesy of AMNH, Hall of Reptiles.