The largest of the deer family is an ELK, which has three letters, and a MOOSE, which has five letters. ELK are the second-largest species of deer in the world, after the MOOSE. They are native to North America, Europe, and Asia, and can be found in many different habitats. MOOSE are the largest species of deer in the world, and are native to North America, Europe, and Asia. They are typically found in boreal and temperate forests.