Answer: White tailed deer
In the original book, Bambi was a roe deer, but roe deer are not native to North America. Disney considered using a mule deer, common in California, but eventually settled on the white tailed deer, common throughout North America. The movie opens with Bambi's birth, in the next scene you are able to see him learning to stand and walk with help from his new friends. We are able to see the distinctive spots of a white tailed fawn and his white tail.