The first true frogs evolved about 200 million years ago during the time of dinosaurs. Frogs are amphibians. They spend their lives near water, because they must return to the water to lay their eggs. Frog eggs are laid in the water. When they hatch into tadpoles, they breathe with gills, and swim using a tail. As they mature, they lose their tail, develop lungs for breathing air, and live on a land.
Though adult frogs have no tail, they have well developed hind legs, and are experts at leaping and jumping. They are found on every continent except Antarctica. There are thousands of species of frogs and they come in all shapes, colours and sizes.
Frogs have bulging eyes, strong long webbed hind legs for leaping and jumping, and smooth or slimy skin. They lay their eggs in clusters. The Chilean four-eyed frog has a pair of eyespot marks on its rear end. They are really big poisonous glands with spots on them, but they look like eyes when you look at them from behind. The spots are usually covered by the thighs when the frog is sitting, but when it feels any threat, it will raise to rump to expose the ‘fake eyes spot’ and cause them to swell up a bit.
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