How do you crawl in call of duty black ops 2?

Well for the Wii version (only kind i have) you hold the button that puts you in crouch and you should go into prone... but that's for Wii and im not sure about the Xbox and PS3 Versions but i imagine they are the same... hope this helps :)

Well, in 360 you would press on hold the B button.

In ps3 its the 0 button. If that helps any how