Longer Lives for Wild Elephants
Most people think of zoos as safe places for animals,where struggles such as difficulty finding food and avoiding predators dont exist. Without such problems, animals in zoos should live to a ripe old agel.
To learn more about how captivity affects elephants, a team of international scientists compared the life spans of female elephants born in zoos with female elephants living outdoors in their native lands.Zoos keep detailed records of all the animals in their care,documenting factors such as birth dates,illnesses,weight and death.These records made it possible for the researchers to analyze 40
The team found that female African elephants born in zoos lived an average of l 6.9 years.Their wild counterparts who died of natural causes lived an average of 56 yearsmore than three times as long.Female Asian elephants followed a similar pattern.In zoos, they lived l 8.9 s years, while those in the logging camps lived 41.7 years.
Another finding from the study showed that Asian elephants born in zoos were more likely to die early than Asian elephants captured in the wild and brought to zoos.Mason suggests stress in the mothers in zoos might cause them to have babies that are less likely to survive.
词汇:
Ripe adj.成熟的
Captivity n.监禁;束缚
Obesity adj.过度肥胖;肥胖症
《自然》发布2018年度十大科学人物:中国天才少年曹原居首
12首最经典的圣诞歌曲 陪你温暖过圣诞
体坛英语资讯:Barcelona decide not to play LaLiga game in USA
体坛英语资讯:Bayern should buy Werner as Robben successor, says Matthaeus
The Ancient Poems We learn 我们学习的古诗
国际英语资讯:Spotlight: Fate of diplomacy at stake after U.S. withdrawal from Iranian nuclear deal
国际英语资讯:Sudanese army reiterates support for leadership, vows to preserve security
Dont Wait For Tomorrow 不要等待明天
国际英语资讯:Troops patrol streets as Bangladesh gears up for general elections
国际英语资讯:2 Vietnamese tourists killed in bus blast near Egypts pyramids
体坛英语资讯:Han Yu wins 2018 Women’s 9-ball World Championship
国际英语资讯:Number of injured in Indonesia tsunami surges to over 14,000
国际英语资讯:U.S. federal immigration authorities concerned about California sanctuary law
国际英语资讯:Dominican Republic puts climate change high on Security Council agenda
国际英语资讯:U.S. adviser Bolton says U.S. conditions Syria withdrawal with safeguarding Kurds
国际英语资讯:Russian, Turkish military to coordinate in Syria after U.S. pullout: Russian FM
国际英语资讯:Bolsonaro sworn in as Brazils president, calls for rebuilding Brazil
体坛英语资讯:Mauresmo decides to withdraw from captaincy of French tennis team
国际英语资讯:Yearender: U.S. economy could slow down in 2019 amid risks: economists
你的朋友会改变你的智商,从基因层面
体坛英语资讯:Pressure on Kenya rugby team coach after dismal show in S. Africa Sevens
国际英语资讯:Feature: Egyptians flock to markets for Christmas, New Years gifts
国际英语资讯:Death toll in landslides, flooding in Philippines rises to 50
体坛英语资讯:Messi on fire while Bale back on target in Spanish La Liga
I Love You, China 我爱你,中国
体坛英语资讯:Warriors center Cousins to practice with G League affiliate
Writing Stories 写故事
体坛英语资讯:Volleyball: VakifBank defend FIVB Club World Championship title
国际英语资讯:British new pay regulations come into force
体坛英语资讯:Celtics star Irving to miss game against Pelicans with shoulder injury