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All tagged blackvulture
It is exceedingly rare to see birds of different species socializing, but birders will occasionally witness interspecies preening, in which one species grooms another, usually picking at parasites in the process. Now ornithologists are trying to explain the unusual behavior.
Due to climate change and related factors, a dozen or two bird species have expanded their ranges into New York City. Among them: The black vulture, a grim looking fellow with a five-foot wingspan who, in the old days, never strayed this far north.
