The first true frogs evolved about 200 million years ago during the time of the dinosaurs. Frogs are amphibians – in fact, about 90% of amphibian are frogs. 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 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.
