There is a long list of animals in Colorado that are considered to be dangerous. Colorado's most dangerous animal doesn't appear to look menacing, but if you see one in the wild, your best bet is to stay far, far away and give it space to roam. Colorado’s Most Dangerous Animal May Surprise YouAccording to World Population Review, the most dangerous animal in Colorado is the moose. Give Moose Plenty of Space in the WildThe moose is also the most dangerous animal in three other states. See the full list of the most dangerous animals by state at worldpopulationreview.com.