This video from the USA says about itself:
Eastern Kingbird Visits Hellgate Osprey Nest – Aug. 5, 2019
Start your Monday off right with a visit from this sharp-looking Eastern Kingbird to the Hellgate Osprey nest! During the breeding season, these bold flycatchers are fierce defenders of their nesting areas. They are quick to harass bigger birds—like Ospreys, Red-tailed Hawks, or Great Blue Herons—that pass over their territory.
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