They eat plants as well as flesh of other animals. E.g. crow kites and eagles. They have strong grinding teeth for chewing flesh and bones. Animals eat and get their food in different ways. Mosquitoes suck blood from the body of human beings.
Snakes swallow their food whole.
Elephants have a long trunk. They lift their food with this trunk and put in into their mouths. Birds have beaks and claws. Rabbits, rats, squirrel, etc. have sharp front teeth to gnaw seeds and fruits. So that animals remain healthy, grow and get energy to survive and protect themselves from enemies.