The moose, which is the largest member of the deer family, is found throughout northern North America . The moose is a strong swimmer and has been known to dive to depths of 18 feet and remain submerged for 30 seconds in search of underwater roots. An adult bull is a dangerous adversary and is often able to repel attacks by small packs of wolves. They are particularly truculent during the mating season. Possessing a keen sense of smell and hearing, they can only be approached from upwind.