My cat loves to play with fake mice on strings. Sometimes, when she catches one of them, instead of biting or "killing" (attacking with her back feet) it, she holds it in her front legs and starts licking it, in a manner that's similar to grooming.
I've noticed that she does this when she's calmer and has already played for a while, and usually does it to mice who have fake feathers attached - usually goes for the feathers too.
I'm wondering if anyone knows why she does that - just curious. Do cats lick their prey? Does she consider it a 'friend' and wants to groom it? What else can it be?