Cats and can openers

I don’t eat a lot of things that come out of cans.Allegra and Ruby eat mostly raw food, and the occasional canned food they eat comes out of the little flip top cans. So why is it that when I used a can opener the other night to open a can of lentils, both of them came running, even though they had just finished their dinners?

Is it possible that responding to the sound of a can opener is hard wired into our domestic cats’ brains?

Allegra was rescued from a Maryland shelter when she was two or...