Just here looking for animals? Reptiles, birds, farmyard to jungle and more.
Fish live underwater, in either salt or fresh water. They can only breathe underwater, but they use gills to breathe, not lungs like we do. Fish are covered in scales. Some people keep very small fish in their houses as pets. The biggest kind of fish is a whale shark, which is just a really big kind of shark. Whales grow a lot bigger than sharks but they are not fish, as they don't have gills and have to come to the surface of the water to breathe, just like we do.
A flea is a small insect that lives in the hair or fur of an animal. Fleas bite the animal and drink their blood, and can make the animal very itchy because of all the bites. If you have a pet cat or dog you should get it a flea collar or some other flea treatment so they don't get fleas.