Sometimes, a glowing, whitish-gray patch appears in the sky next to the ... the process that makes fireflies light up and causes the blue glow in ocean waves. The research into the structures ...

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

The bill is thin and pale gray. Breeding male: blue-gray above, including most of head and back. Crown has a black line at the forecrown that extends along the sides of crown; white eye ring ...