However, one might find it interesting that there are quite a few large animals that you can legally own in Colorado. Large Mammals You Can Legally Own in ColoradoIt should come as no surprise that you can legally own large domesticated animals like cows, horses, and even llamas, but some of the other mammals on the list that you can legally own in Colorado are more shocking. Large Reptiles You Can Legally Own in ColoradoIt's also legal to own some extremely large, and often frightening, reptiles in Colorado, including members of the Boidae family, also known as giant snakes, monitor lizards, bullsnakes, and tortoises. Gallery Credit: Nate WildeThe Most Dangerous Animals in Colorado + Why They're Dangerous There's no shortage of wildlife in Colorado , and some aren't necessarily the safest to be around. Here are the 11 most dangerous animals in Colorado and what makes them so dangerous.