Eisenberg, John F. (1989) Mammals of the Neotropics, Volume 3: Ecuador, Bolivia, Brazil, University of Chicago Press, p. 97

At the time of his terminal illness [Ralph] Wetzel was convinced there was a genuine possibility of a third species of Choloepus in this region [Brazil, Peru, Ecuador] of upper Amazonas distinct from C. didactylus and C. hoffmanni, but the puzzle was not resolved before his death.

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