Ааааа...балдеть.
www.allaboutbirds.org/look-out-the-backyard-bir...
Alarm calls are actually a spoken language among birds, and several species understand what’s being said.
И еще,
feederwatch.org/blog/angry-birds-alarm-calling-...
Carolina Chickadees and Tufted Titmice are nuclear species in mixed-species flocks, that is, they form the main social group around which satellite species, such as White-breasted Nuthatches and Downy Woodpeckers, forage. Chickadees and titmice might be at the centers of such flocks because of their very social nature—both species live in large, complex groups for most of the year. These social conditions might necessitate wide vocal repertoires because birds need to communicate with many individuals in many contexts. Therefore, chickadees and titmice would be expected to use specific, sophisticated alarm calls when spotting a predator.
White-breasted Nuthatches, however, usually live in pairs and often remain within sight of each other, so they rely less on vocal communication than chickadees and titmice do. Perhaps the less social White-breasted Nuthatch forages with chickadees and titmice because it relies on them to sound the alarm when a predator appears.