有毒生物既可以产生毒素的生物，包括有毒动物（例如毒蛇，河豚）、有毒植物（例如毒芹，箭毒木）、有毒微生物(例如大肠杆菌，黄曲霉）、有毒生物产生的毒素可以危害人类及家畜，甚至危害生命。
也许在以前的生物课上，你学过蛇是由蜥蜴进化而来的，而且最初的蛇是没有毒的，后来出现了更高级的蛇，也就是毒蛇。
Probably back in some previous biology course you learned that snakes evolved from lizards, and that the first snakes weren't venomous and then along came more advanced snakes, the venomous snakes.
狗舌草含有大量有毒且适应力强的生物碱：即使是用它的花制成的蜂蜜也含有稀释后的毒素。
Ragwort contains a battery of toxic and resilient alkaloids: even honey made from its flowers contains the poison in dilute form.
砷是一种对地球上所有其他生物有毒的元素，除了对少数特别的极小的生物。
Arsenic is an element poisonous to every other living creature in the planet except for a few specialized microscopic creatures.
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