The Aldabra brush warbler was a slender bird with relatively short wings and a long, pointed tail.

[2] The Aldabra brush warbler was a shy and retiring bird, difficult to observe in the dense undergrowth in which it lived.

[3] After the discovery the brush warbler was not seen until a survey by Robert Prys-Jones of the British Museum of Natural History from 1974 to 1976.

[3] In 1983, only one male was observed and the Aldabra brush warbler was considered as the rarest and (in its occurrence) most restricted bird in the world.

[1] The possible reasons for its extinction could be attributed to the presence of rats, cats and goats introduced to the atoll many years previously.