There are close to 50,000 known species of spiders, with another 50,000 estimated to be undiscovered. While the creepy arachnids can be frightening to look at, many are harmless to humans. However, there are some that have the ability to cause nasty bites — and in some cases, be deadly. Here are six of the scariest spiders to look out for and steer clear of.

1. Yellow sac spiders

Black-footed yellow sac spider (Image credit: Mark Dean / Getty Images)

There are many species of sac spiders, but the yellow sac spider (Cheiracanthium inclusum) is the most notorious. While not necessarily deadly, "the spider's venom is a cytotoxin (a substance that destroys a cell or impairs its function) that can produce necrotizing lesions" in more extreme cases, said Britannica . The species is

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