Goliath frog

The goliath frog is the world's largest living frog, tipping the scales at over 4 kilograms. These hefty amphibians live only in parts of Cameroon and Equatorial Guinea, where they're losing ground to hunting and habitat loss.

• Can grow as long as a ruler (45 cm from nose to rear)
• Weighs about as much as a large bag of flour (4.5 kg)
• Called 'giant slippery frog' for its smooth, wet skin