In this article we will discuss about the extinction of animals that takes place in a number of ways due to variety of causes. Speciation (evolution of new species) and species extinction (complete elimination of species) are the natural processes which follow the evolution of animals. It is believed that about 200 species of mammals and birds have become extinct [...]
The study of distributional patterns of animals at global scale is carried out in different ways e.g.: (i) Collective study of the distributional patterns of all members of particular species. This involves the division of animals in definite distributional areas on the basis of the abundance of animals species; (ii) Animal distribution is also studied at community level which involves [...]
The following points highlight the two main factors which stimulate, affect and control the dispersal of animals. The factors are: 1. Physical Factors 2. Biotic Factors. 1. Physical Factors: Environmental factors include land and water distribution, sediments, physical barriers, physical events, distance etc. Lands and waters are barriers for the dispersal and migration of aquatic and terrestrial or land animals [...]