Antler Size and Age.

<p>Relationship between age and index of antler size (i.e., Boone and Crockett score in cm) for mule deer (<i>Odocoileus hemionus</i>; closed circles) and American elk (<i>Cervus canadensis</i>; open circles) collected from 20 areas of western North America during 1981–2010. Older age classes (11.5–12.5 for deer and 16.5–21.5 for elk) were not included in this figure because of small sample size.