Frogs are amphibians of the order Anura that are known for their jumping abilities, croaking sounds, bulging eyes and slimy skin. They live all over the world and are among the most diverse animals in the world, with more than 6,000 species.

Some frogs have toxic skin. Some South American frogs are so toxic that one drop of their skin secretions can kill an adult human. Poison frogs usually have bright colors to warn predators that their skin is toxic. Camouflage is another survival technique. Many frogs have mottled green or brown skin to help them blend in with their surroundings.

The largest frog is the Goliath frog, which is 30 centimeters long and weighs 3 kilograms. The devil frog of Madagascar, now extinct, once held the title of largest frog. It was 41 cm long and weighed 4.5 kg.

The smallest frog is the gold frog, which is a tiny 1 cm long and only 200 grams).