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Thanks for all your answers guys, think I agree with you all, he is a bit greedy alright, other cats never come in but I don't think he understands the properties of glass, he knows he can't get through it but thinks the other cats can get in so scoffs everything before any other cats get it. Very funny actually, we put his food out one day and he sat guard at the end of the garden to make sure no other cats came in to get his food-all the while the birds one by one flew down and emptied his dish