There's one species of snake, the brown tree snake, that uses both constriction and venom, depending on its prey.

有一种蛇——棕树蛇——会根据猎物的不同，同时使用毒液和挤压的方法来杀死猎物。

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Snake venom is a mixture of proteins, some toxic, poisonous, and some not.

蛇毒是一种蛋白质的混合物，有些有毒，有些没毒。

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By analyzing the DNA, the genetic material of the proteins, the researchers could focus on the toxic genes and use them to trace the evolution of snake venom, and from this, the evolution of snakes.

通过对 DNA 及蛋白质中的基因物质进行分析，研究人员可以专注于有毒基因，并利用它们得到蛇毒的进化轨迹，这样也就知道了蛇的进化源。

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Dr Nicholas Casewell, an expert in snake venom at the Liverpool School of Tropical Medicine, has recently highlighted the potential of venom as a drug source.

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Encouraged, they introduced the DTP vaccine, which protects children from diphtheria, tetanus and pertussis (still a top seller), followed by an anti-snake-venom serum for snakebites.

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It's the inland taipan - known as the "fierce snake" because of the strength of its venom.

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