Porcupines have pricks on the outside.
It all depends on how you look at it
The former builds weapons, the latter targets
A cactus has all the pricks on the outside.
On a hedgehog the pricks are on the outside.
The porcupine has pricks on the outside.
Porcupines have pricks on the outside
Carefully!
The pricks are on the outside of a porcupine