Calls by several birds (May, PA).
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Whistles often presage taking flight. Whistle and trill of a bird taking off (July, ME).
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Trills between several pairs of birds, some were performing the "courtship-hopping" display, where they sit alongside each other and pass a food item to each other (May, NJ).
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Rapidly repeated begging calls of an adult female, termed the female courtship call (June, NJ).
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The begging trills of juvenile Cedar Waxwings are very similar (July, PA).
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(sonagram has vegetation artefact)
Many of the trills in the following recording have a large frequency range, making them sound lower. This is a characteristic of the male courtship call (BNA).
Several birds perched in an evergreen (with Western Bluebirds, Feb, NV).
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