冬眠是动物在不利的气候和生活条件下的一种本能的适应。象青蛙、乌龟、刺猬、蝙蝠和蛇等都属于冬眠动物。动物学家把一种能够控制冬眠的动物血液里的物质叫做HIT(英文的缩写,意思是能引致冬眠的物质)。在实验中,研究人员把这种HIT提取出来,注入到没有冬眠习性的猴子的脑部后,猴子的心跳速度减了一半,体温也降了几度,而且还明显地降低了食 Hibernation is an instinctual adaptation of animals under unfavorable climate and living conditions. Like frogs, turtles, hedgehogs, bats and snakes are all hibernating animals. Zoologists call the substance in the blood of an animal that controls hibernation a HIT (abbreviation in English, meaning a substance that causes hibernation). In experiments, researchers extracted the HITs and injected them into the brains of non-hibernating monkeys. The monkey’s heart rate was halved and body temperature dropped by a few degrees, and the food was also significantly reduced