Дронговая кукушка Surniculus lugubris

A small, slim black cuckoo rather similar to Black Drongo but smaller, with a curved bill. Adult black with white bars in the undertail, shorter-tailed juvenile deep blackish gray with bright white dots in wings and flanks. Rather sedentary and difficult to see in tangled vegetation of scrubby and edge habitats in lowland and foothill forests. Song a loud, vibrant, rapid series of ascending hoarse whistles.