“In effect then,whistles that mix with chucks say ‘there’s an enemy of average threat that’s here’,and whistles without chucks say ‘there’s an enemy of seemingly average threat around here somewhere’,while pure chirps say,‘I’m hiding here because there’s an immediate danger.’” Hare told Discovery News.

　　Hare and some other researchers believe such sounds are part of an advanced language that develops just as all other communication systems.

　　Although squirrels risk their lives when they call out to warn others of threats,other squirrels might admire this behavior,thus increasing the caller’s social status,like humans who look up to heroes.Hare added that other animals,such as birds,probably understand at least some squirrel language,since they also may benefit from the alarm calls.

　　In fact,another Canadian study found that deep-voiced,black-capped chickadees have their own language too.According to certain research,there are a lot of tidings in chickadees’ calls,such as directing fellows’ activities,keeping in contact between mates,and raising alarms.

　　While chickadees and other birds are often welcomed into gardens by homeowners,squirrels are frequently viewed as pests(害兽).Hare wishes a greater understanding of the complex social lives and communication systems of squirrels will provide “hope that humans will gain a greater appreciation and stop doing harm to these animals.”

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