There are a few very colorful snakes that both fall under the categories of "for sure hots" and "not so for sure hots," all of which aren't exactly known for fatal venom makeups. If you're into elapids but the wife is dead set against the extremely dangerous varieties, the Aspidelaps 'cobras' (coral cobras and shield noses) from African come to mind. They stay small, are easy to manage, thrive in captivity, supposedly breed pretty readily, and are gorgeous, quirky snakes. I believe I've heard anecdotes of an infant or toddler being killed by one, but nothing definitive. I'll put it this way: I'd rather be nailed by one of my coral cobras than an adult copperhead.
Let's see...the night adders (Causus rhombeatus) aren't extremely colorful, but they are pretty neat. They're toad eaters in the wild and can sometimes be tricky to get onto rodents in captivity, but I do know a couple of well known keepers and dealers here who have been bringing them in from time to time of late.
Eyelash vipers (Bothriechis schlegelii) are gorgeous arboreal viperids that are not known to be deadly in general. They come in a wide array of colors and patterns, make amazing display animals, and thrive in captivity once they're feeding well on whole pinks (the babies are tiny!). The drawbacks: being arboreal vipers, they have amazingly long and deceptive strike ranges - meaning they can pretty much hang on with the tip of their tail and fling their body out in a strike. Babies eat pink tails - not really, but pink parts for sure. They tend to be a little more on the expensive side, but they're also always in demand. They don't need much space, even as fully grown adults.
As for the "not so for sure hots," there are a large number of rear fanged snakes available in the hobby. A few you may want to avoid if you're not wanting something extremely toxic - boomslangs (Dispholidus typus), twig snakes (Thelotornis sp.), and keel backs (Rhabdophis sp.) come to mind. There are loads of Central and South American and Asian species though that are both colorful and active. Rhino ratsnakes (Rhyncophis), and Baron's racers (Philodryas baroni) both come to mind. Vine snakes, both Asian (Ahaetulla) and Cen. American (Oxybelis) almost make good display specimens but can be difficult to get feeding. False water cobras (Hydrodynastes or whatever they are now) are a personal favorite - they get huge, have crazy feeding responses, and are diurnal cruisers. And of course there are tons of Boiga and other crazy rear fangs, most of which are more or less harmless to humans.
So, there are lots of animals from which you could potentially choose. Again, I'll recommend getting something that genuinely interests you.
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Chance Duncan
www.rvexotics.com