Small spiders can't bite people's skin because their fangs are too short (no matter how poisonous), but it's hard to say whether they are big or not. I heard that some big-haired spiders can eat.
Birds, mice, cats or poisonous snakes ...
First of all, giant poisonous spiders are mostly hairy spiders, but they are better than hairless spiders. Hairy spiders mostly hunt and burrow like tarantulas, while hairless spiders are smaller but scarier (such as the most notorious black widow).
Different types are distributed in different areas. I have seen a green hairless spider about 30 cm long (a bite is absolutely enough) crouching about 3 cm on the Internet.
The venom of a bird-eating spider with the same proportion and concentration is equal to the venom of more than 30 cobras, but the venom released by a cobra is dozens of times that of a bird-eating spider (horrible ...).
I'm from Guangxi. If a spider at home accidentally "urinates", it will burn the skin (adults say so), and it will cause many water bags and pustules, which will be red and some serious, so it needs to go to the hospital for intravenous drip.
So like spiders that appear at home, I know this by accident, and another is a cancer spider. This kind of cancer spider is called a tall spider or a domestic spider (with long feet). Often haunting at home, one of the most common spiders in the home, this spider has certain toxins. If you are bitten, rinse and disinfect with running water immediately, and then seek medical attention in time!