The Alaotra Grebe, also known as Delacour's Little Grebe or Rusty Grebe, is or was a grebe found only on Lake Alaotra and surrounding lakes in Madagascar. The last sighting was in 1988 and it may well be extinct, but all areas of remaining habitat have yet to be thoroughly searched. This species declined in the course of the 20th century, mainly due to habitat destruction and predation by introduced snakehead murrel. Also, the few remaining birds increasingly hybridized with Little Grebes which use the wetlands as a migration stopover site; as the species differed in several key aspects, the hybrid birds may have suffered from decreased fitness, to the detriment of the rufolavatus gene pool

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