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temperature. In very cold weather, the atmosphere is condensed; molecules in the air contract and draw close together. Sound waves made by the calling of the jay and nuthatch strike the solid matter of falling flakes and are reflected back.
To squeaky snow, jay calls, and nuthatch talk was added the distinct three syllables, “jo-reep-er, “jo-reep-er,” of a Carolina wren. I was sure the bird was singing from a perch next door, yet it sounded as if
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