Tern sea terns have light grey or white body plumage as adults, with a black cap to the head. The legs and bill are various combinations of red, orange, yellow, or black depending on species. The pale plumage is conspicuous from a distance at sea, and may attract other birds to a good feeding area for these fish-eating species. When seen against the sky, the white underparts also help to hide the hunting bird from its intended prey. The Inca tern has mainly dark plumage, and three species that mainly eat insects, the black tern, white-winged tern, and black-bellied tern, have
Miller Tern brakes and an optional tail-mounted drag chute. The cantilever wing uses a Wortmann 61 series airfoil. The basic Tern has a wingspan that gives a glide ratio of 34:1 at , while the longer span Tern II, with its wingspan, has a glide ratio several points higher. In March 2011 there were 14 Terns on the Federal Aviation Administration register, including 4 Tern IIs and one Tern 17M. All Terns are registered in the USA as "Experimental - Amateur-built" In March 2011 there were two Terns registered with Transport Canada, both amateur-builts. Miller Tern The Miller Tern is an American