uropygium

Seaside Sparrows have a mid-dorsal row of downs in the dorsal tract near the uropygium.

The tail length, however, is measured from the base of the uropygium to the tip of the longest pair of rectrices.

Associated words: caudal, dock, scut, prehensile, caudate, bicaudal, rump, uropygium. tailless, a. acaudate, anurous. tailor, n.

The uropygium also, which in the European bird is entirely white, is in our specimen partially variegated with black.