Hmm.
See if you have a lightbulb on your white balance setting.
ISO 100
Shutter Speed 125
Aperture around 5.6 - 8
Might want to check to make sure the lens is clean. If it's a removable lens, make sure the inside is clean too.
You can try to take a pic of a darker snake or object and see if your are getting that "blur" look.
And now back to drooling over those snakes :p