Dear Kitty. Some blog

This 2019 video from North America is called Male brown-headed cowbirds calling & spreading wings.

From the University of Illinois at Urbana-Champaign, News Bureau in the USA:

When warblers warn of cowbirds, blackbirds get the message

March 31, 2020

This is the story of three bird species and how they interact. The brown-headed cowbird plays the role of outlaw: It lays its eggs in other birds’ nests and lets them raise its young — often at the expense of the host’s nestlings. To combat this threat, yellow warblers have developed a special “seet” call that means, “Look out! Cowbird!”

In a new study, researchers at the University of Illinois at Urbana-Champaign report that red-winged blackbirds respond to the seet call as if they know what it means.

“Does this mean red-winged blackbirds understand that the call is specific to cowbirds or are they just responding to a general alarm?” said…

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