Encyclopedia of endangered species. / edited by Mary Emanoll ; in Association with IUCN-the World Conservation Union.

Contains preponderance of mammals and birds though a good number of lesser - known species , such as reptiles , amphibians , fish , invertebrates , and plants.

and low viability of population due to their small size )

and the underlying factors that gives rise to these threats . Included too are poverty and rapid economic development as factors contributing to the loss of species .

Discusses the threats to species which is : immediate threats ( loss of habitats , direct over - exploitation , competition with introduced invasive species