Hare, a professor of zoology at the University of Maniloha in Winnipeg, and his team managed to record squirrels’ alarm calls. The researchers studied the sounds and then played them back to 60 wild squirrels, which the scientists approached individually with a video recorder to capture(抓拍)their responses. Some squirrels lifted their heads up and became alert(警惕的). Creatures that were more frightened simply ran for their lives and dived into caves.

　　“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 behaviour, thus increasingly 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.

【2017届高考英语一轮阶段评估检测3 必修3】相关文章：

★ 江苏省扬州市2014高考英语一轮 阅读理解暑假练习题（10）

★ 四点2015-2016高考英语第二轮复习建议

★ 【人教版】2014届高考英语一轮复习指导考点针对练：必修2 unit4《Wildlife protection》

★ 2017届高考英语二轮复习大题冲关秘籍阅读理解七选五：名校模拟（含解析）

★ 【三维设计】2017届高考英语（江苏专用）二轮复习课件：必修2 Unit 3《Amazing people》

★ 【浙江专用】2014届高考英语一轮复习课时作业(三十四)选修7Unit 4《Sharing》

★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (2)

★ 2014届高考英语一轮复习课时作业(三十七)选修7Module 1《Basketball》（外研版）

★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (31)

★ 2014届高考英语一轮复习课时作业(一)必修1Module 1《My First Day at Senior High》（外研版）