Nuisance cats can cause damage to plants and wild life. A cat has many predatory instincts which are lived out when they are able to forage freely beyond the confines of their home. Many times they will prey upon innocent birds and wildlife which are easy targets around bird feeders . Cats will spend hours howling their ritual mating calls throughout the night. Such noises can be annoying as well as disruptive to people trying to sleep.
Cats like to leave scent markings to let other cats know their territory.
This smell is both offensive and lingering. Many times it will lead to more cats coming around. In extreme cases, cats will learn how to live in the wild which will lead to established populations . These populations are often responsible for feeding on livestock, local bird populations and any other small animal they can find. If left unchecked, they will develop disease which can easily spread.