Saying rats are sweet and clean might strike some as more oxymoronic than talking about diet French fries. But rats really are clean, sweet — and intelligent — and make for some very cool pets. We’re not talking about scouring your nearest garbage dump, wharf or sewer drain and plucking a rat off the street. That’s akin to bringing home a feral dog. But we are talking about Norway rats, the same variety you find on the street that were instead bred to be domestic, usually with the intent of feeding reptiles. You can get Norway rats at pet stores around the world, with the savvy stores knowing they can jack up the price if they happen upon one with fancy patterns and colors. But even a high price is worth it for a pet rat based on all the rewards.