But amphibians only see in black or white. A frogs skin reflects the same amount of ultraviolet light as its immediate surroundings. This way it can protect itself from predators like snakes. The golden dart frog is the most poisonous frog on earth and the skin of one frog could kill up to 1000 people. In recent years a painkiller with 200 times the power of morphine has been found in the skin of a frog.
Some frogs can survive in conditions well below freezing.
The Grey tree frog for example can survive even though its heart stops. It does this by making its own antifreeze which stops its body from freezing completely. The male Darwins frog takes the eggs into its mouth as soon as they show signs of life and they stay there until they emerge as fully grown froglets. Frogs cannot live in the sea or any salt water. There are more than 4000 types of amphibian in the world, but Europe has very few, only 45 species.