HomeGlossary Bird topography Mantle The upper back, between the nape and the scapulars. In gulls, the shade of grey on the mantle and wings is one of the first things to judge. Bird topographyRelated termsFull glossary Rump The lower back, just above the base of the tail. Cere The bare, often coloured skin at the base of the upper bill in raptors, parrots and pigeons. Tarsus The lower, usually bare, part of the leg above the toes. Lores The area between the eye and the base of the bill. Supercilium A pale stripe above the eye, often called the eyebrow. Primary projection How far the primary tips extend beyond the tertials on a perched bird.