Several species of snakes, including Cropan’s boa, Ramsay’s python and the Round Island boa, are endangered as of 2014. The short-nosed and leaf-scaled sea snakes that live in the coral reefs surrounding Australia are also critically endangered.
Snakes have few natural predators that reduce their numbers significantly, so the endangerment of species is often related to environmental causes. Snakes with relatively small areas of habitation, like the Brazilian Cropan's boa and North America's San Francisco garter snake, are susceptible to endangerment as human settlements encroach upon their natural habitats. The Round Island boa became critically endangered, and its relative the Round Island burrowing boa became extinct, when domesticated animals brought to the island drastically reduced the numbers of the lizards, which were the snakes' primary food source.