The Seychelles sheath-tailed bat (Coleura seychellensis) is a sac-winged bat. It occurs in the central granitic islands of the Seychelles. It was probably abundant throughout the Seychelles in the past, but it has declined drastically and is now extinct on most islands.It is one of the most endangered animals, fewer than 100 are believed to exist in the world. The Seychelles sheath-tailed bat has suffered from habitat deterioration due to the effects of introduced plant species.