There are different kinds of animals, all of them very important in nature. For example, we fear sharks and consider them dangerous, as they naturally contain sea water clean and filtered.
Mammals, those that feed their babies milk, among them cows, dogs, dolphins, kangaroos, and many others. Insects are small creatures with lots of legs and usually wings. The birds are all animals with feathers. Fish live under water and can swim. Reptiles are animals without wings who lay eggs, among them snakes, crocodiles, lizards and some others. All these groups of animals contain some pretty dangerous types.
Pets play a very important role in people's lives. While people care about them, they give something useful in return. For example, chickens give eggs, cows give milk, dogs protect people, cats catch mice, sheep can give fur...