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https://books.google.com/books?id=up_aBwAAQBAJ&pg=PA344&dq=songbirds mobbing a crow&hl=en&sa=X&ved=0ahUKEwi2rdjl-LfWAhVK5SYKHVQBBbkQ6AEIKDAA#v=onepage&q=songbirds mobbing a crow&f=false