Longspur rattles are similar to each other. I find it useful to think of the notes of the Lapland Longspur rattle as being similar to the alarm call of the eastern Winter Wren (June, AK).
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The Snow Bunting rattle is mellower and lower. Flock taking flight, also with buzzy calls (Jan, NJ).
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rattle
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buzzy flock call
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probable alarm call at beginning of cut
The Smith's Longspur rattle is higher (June, AK).
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McCown's Longspur has a squeaky rattle.
Other calls
Two Lapland Longspur calls (by males) I recorded on the breeding grounds in Alaska were a three-parted jer-hu and a buzzy call, also three-parted, described as foraging calls in BNA (June)
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A less commonly heard call by Smith's Longspurs is an Eastern Meadowlark-like buzz (there is also a clear syu). (Jun, AK)
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The common Chestnut-collared Longspur flight call is a cher-dee (bird in flight, May, ND).
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