The only groups to contain a higher proportion of threatened species are cycads (63% threatened species 5), amphibians (41% 5, 11), corals (33% 5, 21) and conifers (34% 5). Therefore, three of the five most threatened groups assessed to date are plants. By comparison, 25% of mammal species 5, 12 and 13% of bird species are threatened 5.
