More info about owl pellet: http://www.nocs.leeca.esu.k12.oh.us/bnut/owlpellets.htm

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owl pellet has description gray
owl pellet has description 1 - 3 inches long
owl pellet has description 3/4 - 1 inch wide
owl pellet has description odorless
owl pellet has characteristic useful to scientists
owl pellet has characteristic contains identifiable prey part
owl pellet has characteristic expelled ~12 hrs. after eating
owl pellet may contain 0 - 5 skulls
owl pellet may contain many small bones
owl pellet may contain fur and other debris
owl pellet often used for study of small mammal distribution
owl pellet often used for study of owl nutrition
owl pellet often used for study of owl behavior
owl pellet regurgitated by owl
owl pellet occurs at site below the owl roost
owl pellet included in raptor pellet