The fruit bat (flying fox) species "Pteropus natalis" is only found on Christmas Island; its epithet "natalis" is a reference to that name. The species is probably the last native mammal, and an important pollinator and rainforest seed-disperser; the population is also in decline and under increasing pressure from land clearing and introduced pest species. The flying fox's low rate of reproduction (one pup each year) and high infant mortality rate makes it especially vulnerable and the conservation status is as critically endangered. Flying foxes are an 'umbrella' species helping forests regenerate and other species survive in stressed environments.