Why does Jesus refer to serpents positively in Matthew 10:16? It seems that most places in the bible where serpents are referred to they are a reference to Satan/the devil. Yet in Matthew 10:16 Christ says


  "Behold, I send you forth as sheep in the midst of wolves: be ye therefore wise as serpents, and harmless as doves." (KJV)


Why does Christ ask us to derive inspiration of wisdom from something that typically represents the devil? I am confused and find this to be a bit contradictory.
The Bible has many metaphors for many things. Some of them use the same item in two different contexts in two different ways. Immediately, I can think of Christ's use of the word "sign" and how he would and would not provide one (John has seven signs which demonstrate Christ as Lord, but the Synoptics say that signs will not be given). The asp was something deadly and was a sign of wickedness, but when it was raised on a staff, it became a instrument of healing.

I think that "serpent" here is probably just a snake.