In the X-Men movies, the sound of Wolverine’s claws shooting out was made by tearing a turkey apart and also cracking nuts to give a sense of metal protruding through flesh.

The cheetah has “semi non-retractable” claws (almost like dog claws) that work like the cleats on a football shoe to give the cheetah a lot of traction when running. The pads of most cats’ paws are soft, but the cheetah’s pads are hard kind of like the rubber on a tire. This also helps them grip the ground when they are running so fast.