Thin and long tailed, with outer tail feathers almost entirely white (tail from below looks white). The bill is thin and pale gray. Breeding male: blue-gray above, including most of head and back.

The animal kingdom gives us rainbows of color with butterflies and chameleons, and clownfish, but birds give us just as much ...

Long wings; relatively short tail; straight, sharply pointed largely blue-gray bill with a blackish ... white wing patch on coverts; flight feathers also widely fringed white.