This Element addresses the study and documentation of objects made from the durable materials of animal bodies, including bone, antler, ivory, and keratinous tissues. This category of artifacts is common across cultures and regions, yet often escapes close study. The Element aims to be a guide to understanding and documenting worked animal objects for those without a background in zooarchaeology or experience with such artifacts. This Element provides a means of identifying and distinguishing animal materials by emphasizing the value of caution and making full documentation of all observations. Using illustrations and descriptions to help researchers understand the structure of these materials, the volume introduces the terminology and diagnostic factors that differentiate animal materials. It also outlines the techniques craftspeople used to modify animal materials in the past. Finally, this Element presents recording strategies for individuals wishing to study assemblages from archaeological excavations.