20CMS.,BLACK AND WHITE BIRD WITH A LONG TAIL,MALE HAS BLACK UPPER PARTS,HEAD AND THROAT APART FROM A WHITE SHOULDER PATCH. UNDERPARTS AND SIDES OF LONG TAIL ARE WHITE.COMMONLY SEEN IN PARKS,GARDENS,SCRUB,FOREST.NOT PARTICULARLY SHY.THEY NEST IN TREE HOLLOWS,NICHES IN WALLS OR BUILDINGS,THEY FEED ON INSECTS AND OTHER INVERTEBRATES,OCCASIONALLY THEY CAN FEED ON FLOWER NECTAR,LEECHES,CENTIPEDES AND EVEN FISH.FEMALES ARE GREYISH BLACK ABOVE AND GREYISH WHITE BELOW.THEY ARE PARTICULARLY WELL KNOWN FOR THEIR SONGS.