Reindeer are members of the deer family and are the only member whose females also grow antlers. The females (cows) retain their antlers until their calves are born in the spring, and the males (bulls) drop theirs after the autumn “rutâ€, or mating season. Mature bulls will average 350 pounds and cows will weigh around 200 pounds. Alaska’s most northern reindeer will often weigh less than those from Alaska’s south or Interior due to food scarcity.