Why some songbirds make migratory pit-stops to replace worn and ragged feathers

[PhysOrg]

As we pass the spring equinox, lengthening days promise the return of warmth and with it, the return of migratory songbirds. In Canada, we welcome back our songbirds, relishing the profusion of song and color that once again fill wild (and not so wild) places. We revel in their company until summer ends and once again they leave for warmer lands.

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