Lesser Coucal

The lesser coucal is a cuckoo of marshy land with grass and tree cover, with a wide range that overlaps with several similar species. It is separated by its smaller size, less prominent bill, pale shaft streaks on the head and back feathers, a much longer claw on the hind toe and a distinct call. It is one of the few coucals with seasonal plumage differences, but the sexes cannot be told apart in the field (Wikipedia, general species account).