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(ad male Aug, PA)
Agonistic call (Aug, PA)
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Sound of wings during the dive display in front of a female, where the male moves to and fro in a U-shaped arc (May, PA).
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The Rufous Hummingbird chip is a higher squeaky chup, recalling junco (imm female, Jan, PA).
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Anna's Hummingbird is similar but higher and harder (Delaware's first record, Dec).
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Broad-tailed Hummingbird, a finch-like call (adult male with wing noise, June, CO).
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