murmurate

Verb

 * 1)  Of starlings, to gather in large flocks at dusk.
 * 2) * 2009, Daniel Butler, The mathematics of murmurating starlings, The Telegraph:
 * By dusk this murmurating cloud can number thousands or even millions of birds.
 * 1) * 2013, Ruth Bass, Word playing gives birds new nicknames, The Berkshire Eagle:
 * There's a glister of goldfinches, an exaltation of larks, a swoop of swallows, a chain of bobolinks, a scold of blue jays, a murmuration of starlings, which are at their best when they murmurate by the hundreds across a gray sky.