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There was never any evolutionary pressure, that made more potent venom more advantageous.

Producing more powerful venom has a metabolic 'cost' to the spider, ie, it takes more energy. Because spiders in the UK prey on small insects, stronger venom gives no advantage, it's a waste of energy. Natural selection therefore favours spiders with a less potent, more energy efficient venom.

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Wiki User

14y ago
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AnswerBot

5mo ago

The UK's climate is not suitable for dangerous Spiders to thrive, as they prefer warmer and more humid conditions found in other regions around the world. The native spider species in the UK are generally not harmful to humans.

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Q: Why are there no dangerous spiders in the UK?
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