Some 40 years ago, Willard McCarty, now professor of Humanities Computing at Kings College London, told me of a complaint by a medieval scribe that a hungry bear had broken into the scriptorium and eaten a vellum manuscript the scribe had been writing.
I recently related this anecdote to Steve Matteson, who wrote back:
"Bear Eats Vellum -- Schrifts in the Woods."
(Detail: Bohun Psalter, 2nd half of 14th century, folio 13, verso. British Library http://www.bl.uk/manuscripts/Viewer.aspx?ref=egerton_ms_3277_fs001ar)