what is a red data book?
A Red Data Book is a book which is published by the IUCN (International union for conservation of nature and natural resources). It contains the list of organisms whose continued survival in the present state is threatened. It contains the names of all species which are threatened and classified under various categories like threatened, endangered etc.
TheIUCN Red List of Threatened Species(also known as theIUCN Red ListorRed Data List), founded in 1963, is the world's most comprehensive inventory of the globalconservationstatus ofbiological species. TheInternational Union for the Conservation of Nature(IUCN) is the world's main authority on the conservation status of species. A series ofRegional Red Listsare produced by countries or organizations, which assess the risk of extinction to species within a political management unit.