12 CMS.,IT IS SMALL SIZED WITH SHORT TAIL.FOUND AT 1800 TO 3300 METRES IN SUMMERS AND AT 900 TO 2000 METRES IN WINTERS.FOUND NEAR ROCKY MOUNTAIN TORRENTS, ALSO NEAR SLOWER WATERS IN WINTERS.THESE ARE SMALL INSECTIVOROUS BIRDS.ADULT MALES AND FEMALES HAVE BLACK-BLUISH TINGED HEAD (EXCEPT THE FOREHEAD),NECK,CRAW AND BACK.THE WINGS ARE BLACK BROWN WITH THEBROAD WHITE ACROSS BAND.THE FOREHEAD;BAND ACROSS THE BACK;BREAST AND ABDOMEN ARE WHITE.THE TAIL IS DICHROMATIC.THE TWO CENTRAL PAIRS OF THE TAIL FEATHERS ARE BLACK BROWN WITH WHITE BASES;THE OUTER PAIR IS ALL WHITE;THE OTHER TAIL FEATHERS ARE WHITE WITH DARK TERMINAL SPOTS,LESS ON THE OUTER FEATHERS AND LARGER ON THE FEATHERS CLOSER TO CENTRE.THE LEGS ARE PINKISH WHITE ,ALMOST WHITE.THE BILL IS BLACK.THE EYES ARE DARK BROWN.JUVENILES HAVE BROWNISH BLACK UPPERPARTS EXCEPT THE BROAD WHITE BAND ACROSS THE BACK AND THE WINGS;AND WHITISH UPPER TAIL.THE UNDERPARTS ARE WHITE WITH BLACKISH GREY BORDERS ON THE TIPS OF THE FEATHERS OF THE CRAW AND THE BREAST.