murmuration
noun
[ məːməːˈreɪʃ(ə)n ]
• a flock of starlings.
• the action of murmuring.
• "the murmuration of a flock of warblers"
Origin:
late Middle English: from French, from Latin murmuratio(n- ), from murmurare ‘to murmur’. The usage as a collective noun dates from the late 15th century.