Drawing depicting: Picoides tridactylus -- Eurasian Three-toed Woodpecker, Three-toed Woodpecker, pic tridactyle. Alternate name on piece: Picus tridactylus [Three-toed woodpecker], Tracing on tissue. The page is complete with carefully lettered artist, title, and printer cutlines. Reversed on the stone. In the text Gould states that the Latin binomial should have been Apternus tridactylus.