You can further help things out by providing each cat with its own food dish, scratching post and litter pan. Only few of these cats will have the chance to live a decent life in a loving home. Most of them will be dumped in the streets where they will become feral or will die in a pound. Spaying or neutering prevents unwanted litters and helps the overpopulation problem. The personality of the pet is not altered, but rather, the cat becomes less wild and less likely to fight and roam away from home.
Neutering also prevents spraying from male cats.
Both procedures are better-performed around six months of age, but can be done at any age to provide beneficial effects. Do NOT leave candles unattended when cats are around. If you go on vacation, you better leave your cat at home where he feels safe than bring him along to a cottage, trailer or camping ground. Always handle newborn kittens with gloves so that the mother doesn't reject them because they smell like you. When scooping the litter, stir the litter the least amount possible in order to keep odors away.