The new milestone is important because it means reptiles are as diverse as birds, which are generally considered to include around 10,000 species. Uetz predicts that reptiles will soon surpass birds given the rate of recent discoveries, making it the second-largest vertebrate group after fish which contains over 32,000 species.

Globally, there are around 5,500 mammal species and 6,400 amphibians currently.

But despite being among the most diverse vertebrate groups, reptiles are largely unrepresented by the IUCN Red List, which determines whether or not a species is endangered. Approximately all mammals and birds have been evaluated by the IUCN, and over 90 percent of amphibians have been evaluated. In contrast, only 43 percent of reptiles have been evaluated (the number is even worse for fish sitting at 35 percent).