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Older Tree Swallow nestlings flutter their wings in the nest cavity.

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Published on Mar 6, 2016

Tree Swallow nestlings begin to exercise their wings beginning about nestling day 15, and will continue trying to flutter in the nest cavity for the next 4-7 days before the fledge. The more room in their nest cavity, they better able they are to flutter, and those that can are probably better prepared for survival after fledging.

Video from Francois Paquette of QC. Edited by Chris Gates of NY.
For more on behavior of older tree swallow nestlings see:
http://treeswallowprojects.com/coldyn...

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