Scuritologists have words for those like barking, like clicking Donald Duck calls. Researchers from the University of Miami flew gliders painted like hawks and they drove robot cats around campus towards squirrels. They found that only sweeping back and forthtail movements known as flags and vocalizations called moans are associated with a certain predator type. But if a squirrel is chirping at you and twitching its tail, it wants you to please go hell. It hates you.

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