According to the Red List of Threatened Species maintained by the International Union for the Conservation of Nature (IUCN), 1148 species of insects (24.9% of the total), 1467 species of mammals (26.6%) and 2339 species of amphibians (36.5%) are ‘Threatened or Near Threatened’. Dulvy et al. estimate that for sharks and rays this figure is 562 species (53.9% of the total). The IUCN definition of Threatened includes species that are Critically Endangered, Endangered or Vulnerable.
Illustrations: Dru Drury, USDA APHIS, and Nobu Tamura. Photograph: Chris Huh.