(/ˈrɛmɪdʒiːz/), singular remex (/ˈriːmɛks/), while those on the tail are called rectrices (/rɛkˈtraɪsiːs/), singular rectrix (/ˈrɛktrɪks/). The primary function...

breast and ventral regions are a velvety black. The flight feathers (rectrices) are wide, flat, and rigid; velvety black on the inner edges and an iridescent...

the type specimen of Yixianornis (IVPP 13631) preserves eight elongated rectrices (tail feathers) in a modern arrangement. No earlier pygostylians are known...

approximately 6.3–7.5 inches (16–19 cm) long, but 12.2 inches (31 cm) if central rectrices of adult males included. Females weigh about 0.08–0.13 pounds (36–59 g)...

begin to shed before the rectrices. Generally, the upper tail covers begin to shed first. Certain birds lose some rectrices by the end of the third week...

feathers (the boat-billed heron has only nine), 15–20 secondaries, and 12 rectrices (10 in the bitterns). The feathers of the herons are soft and the plumage...

on the breast. Undertail coverts white tinged with blue. Thighs gray. Rectrices and remiges dark blue, the larger feathers duller. Bill heavy, tip strongly...

cassowaries' feathers consist of a shaft and loose barbules. They do not have rectrices (tail feathers) or a preen gland. Cassowaries have small wings with five...

tails are raised upwards and forwards onto their backs like a turkey, the rectrices being held vertically and their undertail coverts fluffed out. They enhance...

function as a flight feather. As the feather bears little resemblance to the rectrices (tail feathers) of the other full Archaeopteryx skeletons, it is generally...