Volume 22, Issue 24, Pages R1032-R1033 (December 2012) The baculum  Paula Stockley  Current Biology  Volume 22, Issue 24, Pages R1032-R1033 (December 2012) DOI: 10.1016/j.cub.2012.11.001 Copyright © 2012 Elsevier Ltd Terms and Conditions

Figure 1 Diversity of bacula. Examples of bacula of North American mammals. Top left: bacula of ground squirrels (Spermophilus sp.) with spoon-shaped distal ends and tooth-like projections. Top right: trident shaped bacula of rice rats (Oryzomys sp.) and voles (Microtus sp.); illustrations demonstrate complexity of bacula shape from different perspectives. Bottom: relatively simple bacula of some large carnivores (two bear species (Ursus) illustrated above a sea lion (Zalophus)). Illustrated by William L. Brudon, reproduced with permission from Burt (1960). Current Biology 2012 22, R1032-R1033DOI: (10.1016/j.cub.2012.11.001) Copyright © 2012 Elsevier Ltd Terms and Conditions