There are billions of different living things on the Earth.
To help study them, biologists have devised ways of naming and classifying them according to their similarities and differences.
There are many different classes or groups of animals, but the five most well known class of vertebrates (animals with a backbone) are mammals, birds, fish, reptiles and amphibians.
Mammals have fur or hair, give birth to live young and produce milk. They are warm-blooded.
Birds have feathers and wings and lay eggs. They fly high up in the sky and some of them sing beautiful songs. They are warm-blooded.
Fish are swimmers of the rivers, lakes and seas. They live in water, have gills to breathe underwater and lay eggs.
Reptiles lay eggs on land and have scaly skin. They are cold-blooded which means they need the sun to warm them up.
Amphibians are very special. They lay eggs in water and their young have gills and live only in the water. As they grow into adults they develop lungs and can breathe air, so can live both on land and in the water.
In this activity, we will be looking at amphibians.