推荐回答(2个)
箭毒蛙,是世界上最小的青蛙,也是世界上最毒的两栖动物。其毒性非常强,冠于一切蛙毒之上。取其毒液一克的十万分之一即可毒死一个人;五百万分之一克,可以毒死一只老鼠。任何动物去吃它,只要舌头沾上一点毒液,就会中毒甚至死亡。
箭毒蛙的外形特征最毒的两栖动物箭毒蛙主要分布于巴西、圭亚那、智利等热带雨林中。
箭毒蛙体型娇小,约为1.5~6厘米之间。但非常显眼,颜色为黑与艳红、黄、橙、粉红、绿、蓝的结合。箭毒蛙种类繁多,大约有170种左右,颜色非常鲜艳,其中以柠檬黄或黑黄相间最为突出。栖居地面或靠近地面,全部属于毒蛙科,但并非所有都有毒。箭毒蛙具有某些最强的毒素。这种两生类动物身体各处散布的毒腺会产生一些影响神经系统的生物碱。
最毒的箭毒蛙
有人说箭毒蛙非常美丽,有人却说它外表诡异,不管怎么样,箭毒蛙就是在这样光鲜亮丽的外衣下,隐藏着最可怕的毒素。最毒的种类是哥伦比亚艳黄色的(叶毒蛙属),仅仅接触就能伤人。其毒素能被未破的皮肤吸收,导致严重的过敏。
分析箭毒蛙的毒性为什么这么小的蛙类毒性会这么强呢?人们作了一系列复杂的研究,表明这种蛙毒物质能够破坏神经系统的正常活动,即:阻碍动物体内的离子交换,使神经细胞膜成为神经脉冲的不良导体,这样由神经中枢发出的指令,就不能正常到达组织器官,最终导致心脏停止跳动。不过,箭毒蛙的毒液只能通过血液起作用,如果不把手指划破,毒液至多只能引起手指皮疹,而不会致人死亡。聪明的印第安人懂得这个道理,他们在捕捉箭毒蛙时,总是用树叶把手包卷起来以避免中毒。印第安人很早以前,就已经开始利用箭毒蛙的毒汁去涂抹他们的箭头和标枪。他们用锋利的针把蛙刺死,然后放在火上烘,当蛙被烘热时,毒汁就从其腺体中渗析出来,之后人们就取其用来打猎。
箭毒蛙
阿马乌童蛙:是一种生长于巴布亚新几内亚的蛙类,全长7.7毫米。是已知世界最小的非寄生或共生的脊椎动物。它们甚至还没有一角钱硬币大,放在手指之间感觉甚至是稍稍使一点儿力就会将他碾死。
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