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CANBERRA Wholesale Tampa Bay Buccaneers Jerseys , Nov. 10 (Xinhua) -- A common species of Australian pigeon uses the sound of its feathers to warn of impending danger, a local study has found.
Researchers from the Australian National University (ANU) found that rather than using vocals, the crested pigeon uses a high-pitched sound produced by its main flight feathers to warn fellow pigeons of predators.
As the pigeon flaps faster to escape danger, the tempo of the alarm signal automatically increases.
Trevor Murray, an animal communication expert from ANU, said on Friday that the team is able to prove that other crested pigeons flee when they hear the warning, proving it is used specifically as an alarm rather than a by-product of flight.
"Crested pigeons signal danger with noisy wings Wholesale Buccaneers Jerseys , not voices," Murray said in an ANU media release.
"It shows that birds really can use their feathers as 'musical instruments' to communicate with others."
In order to prove that the pigeon's whistling feather was an alarm system, researchers used high-speed video and conducted feather-removal studies.
They found that the bird's eighth primary wing feather was responsible for the high-pitched notes with each downstroke.
It was also discovered that the ninth feather produces a low-pitched sound that it was not involved in the alarm.
Researchers played flight sounds of crested pigeons with and without their eighth feather to a flock of other pigeons.
"We show that the crested pigeon produces an acoustic alarm signal with its wings and that it is an intrinsically reliable signal of danger," Murray said.
"The alarm signal is intrinsically reliable because pigeons flap faster to escape predators, and this fast flapping automatically produces the high-tempo alarm signal."
HANGZHOU, Jan. 17 (Xinhua) -- Alibaba plans to pay two elderly employees an annual salary between 350,000 yuan (54 Cheap Tampa Bay Buccaneers Jerseys ,000 U.S. dollars) and 400,000 to work for its e-commerce platform Taobao.
According to a job ad released on its official website Tuesday, Taobao wants to hire two "product experiencers" over the age of 60 to help the company collect user experiences on its new customized shopping platform.
Alibaba said applicants should have an easy rapport with children, have stable groups of friends and have good communication skills.
Apart from that, they must have at least one year of online shopping experience. Being a "group influencer," such as the leader of a square dancing team or a member of a neighborhood committee, is also a plus Cheap Buccaneers Jerseys , according to the company.
Alibaba said the company has seen a massive response and is now short-listing candidates for interviews.
Analysts said Alibaba's move reflects the growing role of the elderly in China's burgeoning online shopping market.
Alibaba's Tmall online marketplace has 30 million registered elderly users, who prefer electronic products and home appliances over other product categories.
According to a survey of nearly 10,000 people aged 50 and older, about 90 percent said they were willing to learn new things, such as online shopping and how to use mobile payment.
At the end of 2016, China had 230 million people aged 60 and older.
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