Status and conservation of all Data Deficient species updated
The IUCN Red List of Threatened Species is the most comprehensive,
objective global evaluation of the conservation status of plant and
animal species. A species is assigned the category Data Deficient “if
there is inadequate information to make a direct, or indirect,
assessment of its risk of extinction based on its distribution and/or
population status” (IUCN 2001).
Its liberal use is discouraged, so every effort is made by assessors to
assign a threat category upon which conservation priorities can be
based. Nevertheless, the paucity of information means that, for example,
almost a quarter of all living amphibians are currently Data Deficient.
The situation is much better for the relatively well-known order Aves:
only 61 (0·6%) of the world's bird species still lack sufficient
information on population size, trends, distribution and/or threats to
be rigorously assessed by BirdLife International against IUCN Red List