Table 2. Number of species of terrestrial vertebrates held in ISIS zoos broken down by IUCN Red List category.

Class	DD	LC	NT	VU*	EN*	CR*	EW	Total species in ISIS zoos	Threatened species in ISIS zoos
Mammalia	27	606	81	122	104	36	2	978	262 (27.0%)
Aves	1	1,956	152	115	62	18	4	2,308	195 (8.4%)
Reptilia†	10	207	50	87	43	48	0	445	178 (40.0%)
Amphibia	3	141	22	28	13	15	2	224	56 (25.0%)
Total	41	2,910	305	352	222	117	8	3,955	691 (23.3%)

^*VU, EN and CR are collectively referred to as threatened species.

^†The reptile assessment by IUCN is not yet complete, so these results only refer to the species assessed in the IUCN Red List version 3.2 (2009).

The seven IUCN Red List categories are DD = Data Deficient, LC = Least Concern, NT = Near Threatened, VU = Vulnerable, EN = Endangered, CR = Critically Endangered, EW = Extinct in the Wild. We further break down the accounting by taxonomic class. Note: In parenthesis are the percentages of threatened species with respect to the species present in ISIS zoos and not with respect to the total number of the world's threatened terrestrial vertebrate species (that information is available in Conde et al. [3]).