Forster's Tern kip (contact call) and keer ( the so-called advertising call,often given by birds carrying fish).
(feeding birds, Apr, NJ).
kip
keerAnother example of the Forster's Tern keer (Aug, NJ).
Common Tern kip and kyeer advertising call (Aug, MA).
kip
kyeer
Forster's Tern "long" call (May, NJ).

Common Tern long call, a series of kyeers that speed up towards the end(Aug, MA).
part of long callLeast Tern contact call (June, NJ).

Least Tern squeaky alarm calls(Aug, MA).
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Least Tern alarm calls and attack call (Aug, MA).

Black Tern kip calls, foraging flock (May, ND).
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Black Skimmers in flight (Aug, NJ).
Black Skimmer flock, some in flight, most resting, with Black-bellied and Semi-palmated Plovers also calling (May, Heislerville, NJ).

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