(ii) Overexploitation of Resources:
A number of species like tigers, giant pandas etc. are on the verge of extinction because of overexploitation of resources.
Pollution is responsible for global climatic changes and for the extinction of most of the species.
(iv) Extinction of weaker species due to aggressive non-native species:
It is responsible for extinction of almost 50% of species on islands all over the world since 1800 AD.
(v) Poaching of wildlife:
Poaching is the illegal killing of wildlife for sale in the internation trade market. The animals are killed due to following reasons.
Some wildlife species are killed for consumption (eating);
Elephants are killed to obtain their teeth for financial gains;
Tigers/lions are killed to extract their skin to be sold for decoration of the drawing rooms of some peoples.