Looks kind of like a white-tail deer butt, you ask me.
http://www.sportsmanschoice.com/A%20Note%20Worth%20Reading/deer.htm
“Several species of deer are found in forests of Central and South America. The brockets (genus Mazama) are small deer, 1.1 to 2.5 feet (0.35 to 0.75 meter) tall and weighing less than 55 pounds (25 kilograms). Brockets inhabit thick forest areas from about sea level to as high as 16,400 feet (5,000 meters) from eastern Mexico to northern Argentina.”