Blue-grey gnat catcher

May2, 2020, Southwestern Ontario, Canada.
They only pause for a moment so you best be fast on the shutter.
Polioptila caerulea
A pair of Blue-gray Gnatcatchers can build up to seven nests in a breeding season. They often re-use nest material from previous nests, which speeds re-nesting. This can be essential to breeding success, since predation, nest parasitism, or mite infestations frequently cause nest loss and brood failure.
source - https://www.allaboutbirds.org/…/Blue-gray_Gnatcatc…/overview

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