Black-backed Bittern Ixobrychus dubius

Tiny secretive heron. Adult male has black back, brown neck, and streaked reddish-brown underparts. In flight, pale upperwing coverts contrast with dark back and dark flight feathers. Female and juvenile lack black back and have streaked underparts. Most commonly observed in early morning or evening clambering along the edge of reed beds. Calls include a distinctive repeated growling or croaking bark.