Cats are carnivores. Cats hunt small prey, primarily birds and rodents, and are often used as a form of pest control. Domestic cats are a major predator of wildlife in the United States; killing 1.4–3.7 billion birds and 6.9–20.7 billion mammals annually. The bulk of predation in the United States is done by 80 million feral and stray cats.
Free-fed feral cats and house cats tend to consume many small meals in a single day, although the frequency and size of meals varies between individuals. Cats use two hunting strategies, either stalking prey actively, or waiting in ambush until an animal comes close enough to be captured.