Living creatures can be classified into groups.
- Amphibians: live on land and in water, lay eggs, have smooth skin, are cold-blooded, e.g. frog
- Birds: have feathers, lay eggs, are warm-blooded e.g. cuckoo
- Mammals: have fur or hair, feed their babies milk, are warm-blooded e.g. cat
- Reptiles: have scales, lay eggs, are cold-blooded e.g. snake