What do you think will effect of extinction of endangered animals to society?

Hi,It's true,my friend,ecological imbalance is the cause for so many diseases in human beings,animals and plants.There are some of the animals which are- The African and Asian elephants, the blue whale, the western gorilla, the read wolf, the tiger, the marine otter and the giant panda are some endangered mammals. In birds, we have the Crested Shelduck, the Marquesan Kingfisher, the Mauritius Kestrel and the whooping crane. In fish, we have the Siberian and Alabama sturgeon, the silver sharks, etc. 1]Irregular usage of pesticides drastically reduce the population of Earth worms leads to loss to the farming community which is beneficial in enriching the soil which indirectly effects on yields. 2]Irregular usage of pesticides on food crops results the extinction of beneficial insects which are useful in pollination..acts as parasites on some harming pests. 3]While we are growing B.T. crops,the B.T. extinct the population of boll worms,fruit borers..leads to heavy increase of sucking pests. 4]Reduced population of crows which are useful in cleaning the garbage. 5]Reduction of Snake population-increase the rat population leads to heavy loss to agriculture and human beings as it is vector for somany diseases..like that cows..horses..