The threats facing living things extend beyond endangered species — those at risk of extinction — to those in decline at unknown rates.

Source: Gerardo Ceballos et al., “Biological annihilation via the ongoing sixth mass extinction signaled by vertebrate population losses and declines,” Proceedings of the National Academy of Sciences Online, March 28, 2017, p. 5,

Data for the graphic are as follows:

Species Endangered Some Concern
Land vertebrates 5,408 3,434
Mammals 1,290 385
Birds 1,846 2,410
Reptiles 477 171
Amphibians 1,795 468

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