Antlers grow annually from the pedicle of the frontal bone of male deer. They are male secondary sexual characteristics, hence are only grown by stags, although in the wider Cervidae family, they also grow in female reindeer (also known as 'caribou' in North America). Antlers are quite unlike the horns of cattle, which do not regrow if removed correctly. Antlers also develop and mature in a manner different to horns and broadly two stages of antler development are recognised: