The number of rediscovered amphibian, bird, and mammal species in each IUCN Red list category and threat level compared to all other species from each taxonomic class.

aA total of 104 amphibian species have been rediscovered, but only 99 of them are in the IUCN database. Six species are not recognized taxonomically by the IUCN.
bA total of 144 bird species have been rediscovered, but only 143 of them are in the IUCN database. One species is not recognized taxonomically by the IUCN.
Categories: EX, Extinct; EW, Extinct in the Wild; CR, Critically Endangered; EN, Endangered; VU, Vulnerable; NT, Near threatened; LC, Least Concern; DD, Data Deficient. Schipper's threat level = [(VU+EN+CR)/(Total−DD)]×100 (see [16]). The range is between [(VU+EN+CR)/Total]×100 and [(VU+EN+CR+DD)/Total]×100. Additionally, 3 EX and 1 EW amphibian species are included in the threat level as individuals of each species were rediscovered in the wild.

a. 共计104个两栖动物物种被重新发现，但其中仅99个收录于世界自然保护联盟（IUCN）数据库，另有6个物种未被IUCN在分类学上认可。
b. 共计144个鸟类物种被重新发现，但其中仅143个收录于世界自然保护联盟（IUCN）数据库，另有1个物种未被IUCN在分类学上认可。
分类标准如下：EX（绝灭，Extinct）、EW（野外绝灭，Extinct in the Wild）、CR（极危，Critically Endangered）、EN（濒危，Endangered）、VU（易危，Vulnerable）、NT（近危，Near Threatened）、LC（无危，Least Concern）、DD（数据缺乏，Data Deficient）。席珀威胁指数（Schipper's threat level）计算公式为：[(VU+EN+CR)/(总物种数−DD)]×100（详见文献[16]），其取值范围为[(VU+EN+CR)/总物种数]×100至[(VU+EN+CR+DD)/总物种数]×100。此外，因3个绝灭（EX）等级和1个野外绝灭（EW）等级的两栖动物物种均有野外个体被重新发现，故将其纳入威胁指数的计算范围。