Beaver fish tail, Platearius, Livre des simples médecines, ca
1480, Paris from Wikimedia Commons:
http://commons.wikimedia.org/wiki/File:Beaver_fish_tail.jpg.....more
Dictionary of Ichthyology
beaver fish tail = the 17th century concept that the tail of a beaver was fish-like and therefore beavers were fish and edible on Roman Catholic meat fasting days. First raised by the Bishop of Québec. See also beaver tail.
