Jackson's Widowbird

A medium-sized dark widowbird. Breeding males are unmistakable, with a long downcurved tail and rufous shoulders. Non-breeding males lose their long tail and become streaky and brown, but keep the shoulder pattern. Females are brown and streaky year-round. Breeds in montane grassland, but sometimes found in cultivation and other open habitats. Otherwise usually in flocks, especially when not breeding. Males give an odd display in which they jump straight into the air. Females could be confused with many other species, but even during the non-breeding season are usually associated with males, which can be identified by their shoulder pattern. Non-breeding males could be confused with non-breeding male Fan-tailed Widowbird, but have a more restricted and less orange shoulder patch. 

Source : www.ebird.org