All birds have gizzards, although not all birds regurgitate pellets like owls do.
Digestion in Owls - The Owl Pages
Barfing Bird Gross Out Article for Students
Owl Pellet Dissection — GrandyCamp
Owl Pellet Dissection & Hike
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Love this tawny owl checking out a hole in an old ash stump that I
Owl Pellets: Down the Hatch and Back Again - - The Adirondack Almanack
Long eared owls always look surprised - The Adirondack Almanack
What's Up with That Owl? Casting Pellets
Owls, pellets and resilience
Owl Pellet Dissection — GrandyCamp
Gray Lady and the Birds
Gray Lady and the Birds