Why are tarantulas such hairy spiders and did you know their venom virtually is harmless to humans?

Why are tarantulas such hairy spiders and did you know their venom virtually is harmless to humans?
These spiders are so hairy and think they are the biggest of all spiders in terms of size and weight.

Do you know why they are so hairy? Their venom is not poisonous to humans unless they are allergic to their bite. It is about like a bee sting. Some are allergic to bees and some aren't. They have a painful bite but their bite doesn't harm you in terms of poison or causing diseases.

Please explain why these spiders seems to be so big and hairy with a non poisonous bite!
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An idea why (explain) and no
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Why are tarantulas such hairy spiders and did you know their venom virtually is harmless to humans?
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