Feral cats can be a bad idea. Our neighbours took one in from the local cat rescue centre. (Very commendable, and I support these charities with contributions.) He's called Alfie. He'd obviously learned to scavenge and beg, poor little soul, as he'll whizz through any catflap or open door and wolf down any food he can find, even though he's now very well-fed. At night he explodes through our catflap and snarls at our three Siamese cowering in their bed on the counter top. He then hoovers up all the food, then vomits copiously all over our kitchen floor before exiting. I've now stopped putting food down unless I'm there to supervise. I haven't told his owners, as I understand completely that Alfie has problems and no-one's to blame. Feral cats can be so difficult to 'civilise'!