Reindeer Cousin is a term used to refer to three species of large deer native to North America and Eurasia. The first of these is the CARIBOU, which is a species of reindeer found in northern regions of North America and Greenland. The second is the MOOSE, a species of deer found in North America and Eurasia. Lastly, the ELK is a species of deer found in North America, Europe, and Asia. All three species are related to the reindeer and are considered its cousins.