The term 'deer cousin' refers to two large mammals that are closely related to deer. The first is the ELK, which is a species of large deer native to North America and Eurasia. It has a brown coat and long, curved antlers. The second is the MOOSE, which is a species of large deer native to North America and Europe. It has a dark brown coat and large, flat antlers. Both ELK and MOOSE are members of the deer family and are considered to be cousins of deer.