A caribou is a type of deer found across North America’s boreal forests and Arctic tundra, Alaska, Northern Europe, Asia, and Greenland. They vary significantly in color and size, with males weighing up to 400lbs and females averaging 355lbs. Caribou and Elk have many differences, the most notable being the size of their antlers. Caribou antlers are much bigger than elk, and both males and females possess them.