The white-tailed shrike (Lanioturdus torquatus) is a small passerine bird from the family Platysteiridae. It is also commonly known as the chatshrike. It occurs only in western Angola and Namibia in thorn scrub. It forages from ground level, where it hops about in large bounds and upright posture, to 25m above ground, scanning for insects. The very short tail, with a small black mark at the tip of the central two feathers, is always carried down, never sticking up. Its range of calls includes loud ringing territorial whistles. (source)