Blunder

What is the origin of this word? In Woolston's *First Discourse on Miracles* (Lond. 1729), at p 28., I find this passage:— "In another place he intimates what are meant by oxen and sheep, viz., the literal sense of the Scriptures. And if the literal sense be irrational and nonsensical, the metaphor we must allow to be proper, inasmuch as nowadays dull and foolish and absurd stuff we call *Bulls*, *Fatlings*, and *Blunders*." This would seem to imply that in Woolston's days *blunder* was the name of some animal; but in no dictionary have I been able to find such a signification attributed to it…