Encyclopedia Dubuque
"Encyclopedia Dubuque is the online authority for all things Dubuque, written by the people who know the city best.”
Marshall Cohen—researcher and producer, CNN
Affiliated with the Local History Network of the State Historical Society of Iowa, and the Iowa Museum Association.
WARTYBACK
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[[Image:wartyback.jpg|left|thumb|150px|]WARTYBACK. Mussel. Also known as the two-horned pocketbook, winged pimpleback, pimpleback, nodule shell, or winged orb shell, this mussel has as rounded shell with two tows of paired knobs.
Its favorite habitat is large rivers or in the lower sections of medium-sized rivers in sand or fine gravel.