DH brought some of these home from Lidl and our new rescue cat got very excited when he rustled the package at her - he thinks she's had them before 
Anyway, it was hysterical watching her with the stick - she flipped it in the air, stood on her back legs trying to catch it, swatted it about a couple of times before springing on it and finally hoovered it up!
She's had them a few times since and it's the same circus act. What do you reckon's in them? (apart from the animal and animal derivatives stated on the packet)