When I was a lad, we had a cat who was partial to eating Mars bars. They made her jaws stick together, to the amusement of the family onlookers, as we watched her straining to get her jaws open for the next bite.

This cat also liked Marmite on toast. Which seems faintly civilised.  

However, she once caught a sparrow in the front-garden, and I was shocked by the sight of her gulping it into her mouth, feathers and all.