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Owl Pellet Bone Chart - A Guide to Bone Parts An owl pellet bone chart is typically used during owl dissection as part of a laboratory activity in biology or ecology class. This is used as a reference guide to identify bones found in owl pellets. Owl pellets are masses of undigested bone, teeth, h Air , feathers, and exoskeletons of various animals eaten by an owl . Owls feed at night and pellets may begin to form six to ten hours after consuming the meal. These pellets pass into the proventriculus where they remain until the owl regurgitates it. The owl regurgitates a single pellet approximately 20 hours after eating or until something stimulates the owl to spit the pellet out. The barn owl can produce one or two pellets per day. A bone chart is basically a chart containing detailed illustrations of different parts of an animal. It may contain bone illustrations from a single animal or a number of animals. The parts are usually identified under which animal it belongs ...