Tuesday, May 7, 2013

Tree Swallow

Back on 20 April 2013, Erika and I listed our first Tree Swallows of the spring. The swallows swooped over the Bass Bonds in the Minnesota Valley National Wildlife Refuge along the Minnesota River in Bloomington. We wondered how these insectivores were surviving. These swallows eat mostly flying insects, although they are known to consume vegetable matter during adverse weather (Winkler et al. 2011). This bird appears to be preening, a behavior certainly practiced by Tree Swallows, but not mentioned by the aforementioned authors.

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