亚洲免费av电影一区二区三区,日韩爱爱视频,51精品视频一区二区三区,91视频爱爱,日韩欧美在线播放视频,中文字幕少妇AV,亚洲电影中文字幕,久久久久亚洲av成人网址,久久综合视频网站,国产在线不卡免费播放

        ?

        Do ostriches really bury their heads in the sand?

        2015-10-12 09:40:21
        科學大眾(中學) 2015年9期
        關鍵詞:警語動物學家鴕鳥

        “不要學鴕鳥,一遇到危險就把頭埋在沙子里?!边@句警語真的對嗎?鴕鳥真的是因為害怕才把頭埋在沙子里的嗎?看起來動物學家不認可這個觀點呢。一起來看看真相吧。

        When frightened, ostriches instinctively bury their heads in the sand in the hopes that trouble will pass them by — or so the legend goes. In reality, ostriches dont bury their heads in the sand to avoid danger. Not only would they be unable to breathe, but when you think about it, they really have no reason to do so.

        Ostriches are the fastest animals on two legs, capable of running as fast as 40 miles per hour for a brief period if they have to outrun trouble. Endurance isnt an issue either for these birds — they can sprint at a brisk 30 miles per hour for a full 10 miles straight if needed.

        If this impressive speed isnt enough, ostriches have plenty of other defenses. They stand around 9 feet tall and weigh in at a whopping 350 pounds. If threatened, they can deliver a kick powerful enough to kill a lion.

        So where did the myth that they bury their heads in the sand originate? Call it good parenting.

        They bury the eggs safely in the ground. A few times a day, the ostrich parents dip their heads below the ground to gently turn the eggs using their beaks. This relatively brief head-duck may have given rise to the head-burying myth.

        The legend could also be attributed to the fact that a nesting ostrich who senses danger may flop down with his head and neck flat against the ground in hopes that potential predators wont spot him. In this position, he can potentially blend into the terrain, though his head never actually goes underground.

        猜你喜歡
        警語動物學家鴕鳥
        國家煙草專賣局印發(fā)《電子煙警語標識規(guī)定》
        國家煙草專賣局印發(fā)《電子煙警語標識規(guī)定》
        盲盒里拆出動物學家
        不會飛的鴕鳥
        幼兒畫刊(2018年11期)2018-12-03 05:11:40
        有趣的鴕鳥
        親愛的,我不是鴕鳥
        安全警語應幽默風趣給人啟迪
        中國石化(2016年5期)2016-02-03 15:13:36
        More to a Smile than Lips and Teeth
        鴕鳥
        小青蛙報(2014年10期)2014-09-22 21:17:45
        印尼將在煙包上印制圖片健康警語
        亚洲综合网一区二区三区| 又色又爽又高潮免费视频国产 | 亚洲午夜狼人综合影院| 国产老熟女网站| 国产啪精品视频网站| 日韩一二三四精品免费| 麻豆夫妻在线视频观看| 青青青免费在线视频亚洲视频| 欧美国产激情二区三区| 国产高清在线精品一区二区三区 | 狠狠综合久久av一区二区| а天堂中文在线官网在线| 久久久久久无码av成人影院| 午夜福利视频合集1000| 久久91精品国产91久久麻豆| 亚洲一区二区三区免费av| 国产极品裸体av在线激情网| 巨大巨粗巨长 黑人长吊| 亚洲精品国精品久久99热一| 无码精品一区二区三区免费16| 久久精品一区一区二区乱码| 成年女人免费v片| 狠狠色成人综合网| 久久国产影视免费精品| 一区二区三区人妻在线| 午夜国产视频一区二区三区| 国产福利视频在线观看| 日韩精品无码久久久久久| 亚洲av噜噜狠狠蜜桃| 国产亚洲av综合人人澡精品| 久久性爱视频| 天天干夜夜操| 无码无在线观看| 国产精品一区二区三区在线观看 | 久激情内射婷内射蜜桃人妖| 国产短视频精品区第一页 | 国产成人无码精品久久99| 精品一区二区三区长筒靴| 亚洲精品国产成人久久av| 亚洲精品国偷拍自产在线观看| 极品熟妇大蝴蝶20p|