Aggression:
Very non-existant. 99.9% of defensive strikes, on the rare occasions they do happen, from a hoggie are in fact close-mouthed.
They don't bite in defense because it's pretty ineffective on real predators, this is pretty interesting when they do it though:
YouTube - Hognose snake playing dead
Toxicity:
http://www.herpnet.net/bite/
http://www.cuttingedgeherp.com/nss-f...tures/MexF.jpg
For cage size/temps hit up a few care sheets, I'm no expert on their care, but they're generic NA colubirds.. 10-20 gal should be fine, use bedding they can burrow in, a bit above room temp for a warm spot (80 degrees?). Brumation is not necessary, but is often done by serious breeders. Humidity is a non-issue unless it's really humid where you live, they typically live in dry climates.
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