Naked Science Forum
Life Sciences => Plant Sciences, Zoology & Evolution => Topic started by: Ian F on 11/04/2010 23:30:03
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Ian F asked the Naked Scientists:
Hi team,
Why have certain spiders evolved poison so powerful, one bite can kill a large mammal like a cow? Most spiders feed on other insects and so it seems venom many times weaker would have the same rapid and deadly effect. But there must be a perfectly good reason as nothing of this nature evolves by accident.
Can you help?
Regards,
Ian Farr
What do you think?
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Maybe they are descended from spider species which attacked bigger prey, and still retain the venomousness ...
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http://www.dailymail.co.uk/news/article-1079895/The-amazing-pictures-giant-spider-eating-bird.html (http://www.dailymail.co.uk/news/article-1079895/The-amazing-pictures-giant-spider-eating-bird.html)
[That's giant spider eating a bird, not "giant-spider-eating-bird"].
or the potent venom could be a defence against bigger creatures who eat spiders.