I've been feeding a family of cats behind a local resturant and since the weather has gotten hot I hardly see them anymore. In the winter they were all there every day waiting for me. Now days and even weeks go by and I don't see some or all of them. If I didn't see each one at least once in awhile I'd assume the worst (and I still do) Where are they going that they don't want my food? Is this pattern normal, or is something bad going on?