Are mice afraid of cats?

Yes, mice are generally afraid of cats because cats are natural predators that hunt, kill, and eat mice, and this fear is both learned and innate. Studies have shown that mice can detect chemicals in cat saliva and urine, specifically proteins called Mups, that trigger fear responses in their brains and cause them to avoid areas where cats have been. The presence of a cat, its scent, sounds, and movements can make mice more cautious, cause them to freeze, flee, or stay hidden longer, and reduce their activity in open spaces. However, being afraid does not always mean mice will leave a house that has a cat, because if the house provides abundant food, warmth, and sheltered nesting sites inside walls and appliances that a cat cannot reach, mice may learn to coexist by becoming more nocturnal, traveling only along hidden routes, and avoiding the cat's favorite areas. A well-fed pet house cat may also have low hunting motivation and may catch only a few mice, while mice breed faster than the cat can eliminate them. So while mice are instinctively afraid of cats and will try to avoid direct contact, a cat alone is not a guaranteed solution for a mouse infestation, and many homes with cats still have mice that learn to live around the cat.