(ii) Overexploitation of Resources:

A number of species like tigers, giant pandas etc. are on the verge of extinction because of overexploitation of resources.

(iii) Pollution:

Pollution is responsible for global climatic changes and for the extinction of most of the species.

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(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.