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Changes in listings and taxonomy since the analysis was conducted in 2009 and errors on our part led to us stating that seven IUCN-listed amphibians and mammals were not protected by the Endangered Species Act (ESA) when they are in fact on the ESA list. As of 10 December 2011, no Critically Endangered amphibians (rather than 2) and 28 (rather than 29) Vulnerable amphibians are overlooked by the ESA. In addition, one (rather than two) Critically Endangered, five (rather than seven) Endangered, and eight (rather than nine) Vulnerable mammals are not on the ESA list. We incorporated these changes to produce a revised Table 2 (below). The revised data indicate

Table 2.  Coverage of IUCN-listed animals (IUCN 2009) by the US Endangered Species Act (USFWS 2009b). IUCN categories: CR =Critically Endangered, EN =Endangered, VU =Vulnerable. Percent of species that are unrecognized by the ESA are given in parentheses. For across-group totals, the mean percent of species unrecognized (± SE) is given.
 Number of CRCR species notNumber of ENEN species notNumber of VUVU species notNumber of species evaluatedTotal 
IUCN-listedTotal
 speciesrecognizedspeciesrecognizedspeciesrecognizedby IUCNspeciesun-recognized
Amphibians  2 0 (0) 1713 (76.5) 36 28 (77.8) 272 55 41 (74.5)
Birds 19 1 (5.3) 14 6 (42.9) 29 18 (62.1) 888 62 25 (40.3)
Mammals  4 1 (25) 20 5 (25) 12  8 (66.7) 451 36 14 (38.9)
Gastropods 6257 (91.9) 3027 (90)103 92 (89.3) 458195176 (90.3)
Insects 10 8 (80) 1210 (83.3) 83 82 (98.8) 207105100 (95.2)
Crustaceans 1713 (76.5) 3723 (62.2)135132 (97.8) 203189168 (88.9)
Total11480 (46.4 ± 16.7)13084 (63.3 ± 10.3)398360 (82.1 ± 6.4)2479642524 (71.4 ± 10.4)

that 71%, rather than 74% of IUCN-listed amphibians, birds, mammals, gastropods, insects, and crustaceans are not considered imperilled by the ESA. The updated figures do not change the main message of our paper: that nearly three-quarters of the IUCN-listed species in the animal groups we studied are not on the ESA list. The updated information also strengthens our conclusion that more highly-imperilled (IUCN status) species are overlooked by the ESA: 46% (rather than 67%) of Critically Endangered, 63% (rather than 65%) of Endangered, and 82% (rather than 83%) of Vulnerable species are not on the ESA list.