Different Ways to Group Animals.

1. Animals can be grouped in many ways according to their external features.

2. Animals in one group have similarities in an external feature but they may be
    different in other external features.

3. For example, eagles, crocodiles and cats can be grouped together because
    they have claws.

4. Eagles can also be grouped together with grasshoppers and butterflies as
    animals with wing.

5. Cats can also be grouped together with monkeys and squirrels as animals
    with fur.