Food Chains can get out of Balance

Sometime human can be the blame of the environment being out of balance. For example, in Australia's sugar cane fields there were two tiny bugs destroying the field by eating them. The scientist were experimenting and thought, if they had toads they would eat the bugs and wouldn't cause any harm to the fields and then it would die for no food. Once the farmers agreed to get the poisonous toads all went the opposite of they were thinking. Instead the toads ate the birds and lizards. The birds didn't have a chance to eat the toads because of the poison they have. The toad population kept growing while the others grew low. Today many unexpected results have happened in food chains and webs.

Food Pyramid