These are the crabs that I made for the environmental learning center. They are made of a heavy gauge wire armature with Sculptey, and painted with acrylics.
Adult male giant land crab
Adult male giant land crab -- notice the eye stalks!
Hermit Crab
Spider crab
Common blue crab
Fiddler crab
Fiddler crab -- hard to take his picture in focus because of the rediculously big claw
Immature female giant land crab (this was the one I had a hard time identifying the legless carcass of)