HOUSTON, Jan. 21 (Xinhua) -- From Texas to Louisiana and Florida, a wide swath of southern United States braced for a once-in-a-generation winter storm with heavy snow, sleet and ice on Tuesday, which ...

鬣蜥是变温动物嘛，它们在寒冷天气中难以维持体温，导致它们暂时处于麻木状态，这会导致它们失去肌肉控制，从而从树木上掉下来。佛罗里达大学的生物学家乔·瓦西莱夫斯基说，当温度降至10摄氏度以下时，鬣蜥的新陈代谢会减慢，一旦温度降至5摄氏度以下，它们就会开始 ...