Like the "Animals in Disarray" puzzle in WORD WAYS (Vol. 1, No. 3, pp. 145-146), this is an anagramming exercise involving the names of mammals - ranging from the entirely familiar to the admittedly unusual. Most of the really obscure or tricky items, however, are included in the "bonus" section at the end of the regular puzzle.
Pinckard, Howard and Cunningham, Charles O.
Word Ways: Vol. 2
, Article 14.
Available at: https://digitalcommons.butler.edu/wordways/vol2/iss3/14