insects

Insects have 6 legs. Insects don't have skin. Insects have there skeleton outside. Insects have so many lenses. grasshoppers make sounds by scratching their leg to their wing  

Mammals

Mammals are hairy and warmblooded and big and humans are mammals.  Mammals need their parents, because they need to drink milk from their mother. 
animals get energy for eating food. Mammals are the only one with hair. Not all mammals live in land some live in water. Smell is very important for mammals.