Bears are anesthetized for a variety of reasons. In areas that humans and bears cohabit, bears may be anesthetized by wildlife managers for translocation and/or marking. Bears may be anesthetized for research purposes or for medical management of sick bears. This article will discuss the anesthesia of bears. The major focus will be on polar bears (Ursus maritimus), brown or grizzly bears (Ursus arctos), and black bears (Ursus americanus). Spectacled bears (Tremarctos ornatus), sun bears (Ursus malayanus), asiatic black bears (Ursus thibetanus) and sloth bears (Melurus ursinus) will be briefly discussed. The first part of the manuscript will focus on considerations for anesthesia of all bear species. The next section will deal with pharmacological considerations. The final section will focus on considerations for individual species.
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