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Scientists tried the same thing with wild birds and found it pretty easy to coax them into new cliques. As part of an ongoing experiment, there were feeders full of sunflower seeds set up throughout the woods. The birds came to the feeders in mixed-species flocks: great tits, blue tits, coal tits, marsh tits and nuthatches. Then all of a sudden, the birds found that some of these feeders had turned hostile. Six of the normal bird feeders disappeared. The other opened only for even-numbered ones.