> Now, all I need is someone to add frog detection code, so the flap won't open when Cagney and Lacey are bringing me "treasure"
I know somebody with an ex stray cat. It has brought home it's food precisely once which was before she fitted the cat flap. She opened the door, looked at what the cat was carrying and then slammed the door before it could get in.
She has since had a cat flap installed, but despite this her cat has never once brought home anything, dead or alive. Now, that could be coincidence. It could be. I'm not convinced it is.