Although many seabirds utter groans and croaks, the Pigeon Guillemot produces a lovely series of trills and whistles. As part of their courtship, they fly side by side in large circles and loops, a perfectly synchronized flying act. These guillemots do not breed until they are between three and five years old. The male chooses a site in a crevice or cave, among boulders, under driftwood, on a wharf, or even in a pipe.

More info and transcript at BirdNote.org.

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