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For anyone else wondering: The bird on the left seems to be a (female) Brown-headed cowbird, found in North America, while the one on the right is a common cuckoo, found in Africa, Europe and Asia.
Wow, even mafia behavior. Hardcore.
The Mafia of Songbirds.
Saw this in a documentary, I’m still fascinated by a bee-eater tried to look after an offspring that’s at least twice its size.
