On the basis of economic importance animals can be divided into two main groups:
Beneficial animals: There are many worms, insects, birds and beasts in the world which benefit man in various ways directly or indirectly, e.g. Bee, Silk worm, various species of fresh water and marine Fishes, Dog, Cat, Goat, Cow, Horse, Ass, Elephant, various species of birds etc.
Harmful Animals: Many animals do harm to man directly or indirectly, e.g. Mosquito, Fly, White ant, Ribbon worm, Round worm, Snakes. Rat, Tiger, Lion etc.
Though apparently, they are harmful to man, in the animal world all animals in one way or the other are necessary. All animals have a particular role in’ keeping the natural balance, food chain etc. So to preserve the existence of animals including the human being, no organisms should be killed unnecessarily. For that the balance of ecosystem may be disturbed, which ultimately will have direct or indirect harmful effects on human society.
To understand the beneficial role of animals, everybody should have at least a firsthand knowledge about the animal kingdom. Animals are valuable and essential resource of a country. It is the duty of all conscious people to be sympathetic towards them and to conserve them. Otherwise many of the animal resources will vanish from the surface of the earth. In the long run the future human society will adversely be affected.
