Endemic birds include the Aldabra drongo ("Dicrurus aldabranus"), the Aldabran subspecies of the white-throated rail ("Dryolimnas cuvieri aldabranus"), the last surviving flightless bird of the Indian Ocean region, and the endemic Aldabra fody ("Foudia aldabrana"), The islands are important breeding grounds for thousands of seabirds, including several species of tern, red-tailed tropicbirds, white-tailed tropicbirds, red-footed boobies, and the world's second largest breeding populations of great and lesser frigate birds. The bird fauna is most similar to Madagascar or Comoros and other birds found here include greater flamingos, the Madagascar pond heron, Comoros blue pigeon, Madagascar kestrel, Madagascar coucal, Madagascar nightjar, Madagascar bulbul and souimanga sunbird.