Eastern kingbirds: Bug catchers of the Bitterroot
Image Courtesy of Heather Tellock
While I often observe small birds chasing larger birds from their territory or nesting site, one bird, in my opinion, tops the list as the most aggressive at defending its space.
Recently, I saw one of these small birds in flight, pulling feathers from the back of an immature red-tailed hawk as it chased the intruder away from its nest. This aggressor is a small perching bird known as the Eastern kingbird.