Thats usually why they always sit on the hood of cars.
I have kitty paw prints on my car all the time 
There is an abundance of feral cats in Avon NC. It's out of control!
STAY POSITIVE!!!!!!!!!!!!!!!!!!!
The Humane Society has a program called TNR - Trap Neuter Release - specifically to address this problem. You live trap the cat(s). The Humane Society will loan you traps if you need. You take them in, they spay/neuter them and give them back to you to release back in their territory. The service is free or very inexpensive. Their ear is "tipped" to identify a fixed cat. Once a group of cats - even a small group of 2 or 3 establishes itself, no other cats will infiltrate the area.
People who continuously kill cats on their property (like a neighbor of mine) will always have a problem because as soon as one is gone, another will come in to take it's place. A vicious cycle. Then there's the other problem, where they will continuously reproduce. Inbreeding is normal among cats. 2 cats can quickly turn into 15.
I have 5 TNR'd cats that have lived on my property for years. I call them my welfare cats because they don't need to work for a living 
http://www.aspca.org/adoption/feral-cats-faq.aspx#tnrHow Does TNR Help Feral Cats?
Through TNR, feral cats can live out their lives without adding to the homeless cat population. “It is very important to have all feral cats spayed/neutered, because it is the only 100-percent effective way to prevent unwanted kittens,” says Aimee Hartmann, Director of the ASPCA Mobile Clinic. “Feral cats are prolific reproducers.”
Furthermore, by stabilizing the population, cats will naturally have more space, shelter and food, and fewer risks of disease. After being spayed or neutered, cats living in colonies tend to gain weight and live healthier lives. Spayed cats are less likely to develop breast cancer and will not be at risk for ovarian or uterine cancer, while neutered males will not get testicular cancer. By neutering male cats, you also reduce the risk of injury and infection, since intact males have a natural instinct to fight with other cats. Spaying also means female cats do not go into heat and therefore they attract less tom cats to the area and reduce fighting. If cats are sterilized and live in a colony that has a caretaker, their life span may reach more than ten years.
How Does TNR Benefit the Community?
TNR helps the community by stabilizing the population of the feral colony and, over time, reducing it. At the same time, nuisance behaviors such as spraying, loud noise and fighting are largely eliminated and no more kittens are born. Yet, the benefit of natural rodent control is continued. Jesse Oldham, ASPCA’s Senior Administrative Director for Community Outreach and the founder of Slope Street Cats, an organization dedicated to feral cat welfare, notes, “TNR also helps the community's animal welfare resources by reducing the number of kittens that would end up in their shelters—TNR creates more space for the cats and kittens who come to them from other avenues.”
Does Eradication Work?
Eradication, the deliberate and systematic destruction of a feral cat colony, by whatever method, almost always leads to the “vacuum effect”—either new cats flock to the vacated area to exploit whatever food source attracted the original inhabitants, or survivors breed and their descendants are more cautious around threats. Simply put, eradication is only a temporary fix that sacrifices animals' lives unnecessarily, yet yields no psitive or beneficial return.
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What Is Relocation and Why Doesn't it Work?
Many communities have rounded up colonies of feral cats for either euthanasia or to relocate them to another area. This never works. Feral cats are very connected with their territory. They are familiar with the food sources, where to find shelter, resident wildlife, other cats in the area and potential threats to their safety—all things that help them survive. “Relocation of feral cat colonies is difficult to orchestrate and not 100-percent successful even if done correctly. It is also usually impossible to catch all of the cats, and it only takes one male and one female to begin reproducing the colony,” Oldham states. “Even when rounding up is diligently performed and all ferals are removed, new cats will soon move in and set up camp.”
