A group of larks is known as an exaltation of larks.The same
collective noun also applies to a group of skylarks or doves.
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an exaltation (in flight overhead)
bevy
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A group of sparrows is most commonly called a "host" of sparrows. They can also be called a "knot" of sparrows. Sometimes they are referred to as a "Quarrel" of sparrows as well.