Nesting Cassin’s Vireo

During a visit to Tualatin Hills Nature Park, I was watching a Cassin’s Vireo pulling material from tree trunks. Eventually she flew up to the nest site, where we can see her nest under construction.

Below is a typical view of a Cassin’s Vireo in the canopy (backlit and facing away). She was weaving material into the nest, then sat down to assure a good fit.

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