A Tree Swallow Female constructs the base and cup of her nest with plant material.

Female tree swallows build the base and cup of their nests out of dead plant material that is available and close by her nest cavity or box. This in-box camera video shows her behavior in this process from start to finish.
Video from Francois of QC. Editing by Chris Gates of NY.
For more on how tree swallows build their nests see:
treeswallowproj...

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