Why do cats sleep inside empty shipping boxes?

Cats are drawn to empty shipping boxes because they combine safety, warmth, and a good hiding spot.

• Security and stress relief: Cats are both predators and prey, so an enclosed box gives them a protected space where they can relax and feel less exposed.
• Warmth: Cardboard insulates fairly well, and a box helps trap a cat’s body heat. That can make it feel cozy, especially in cooler rooms.
• Hunting instinct: Boxes are great ambush spots. A cat can watch without being seen and pounce on toys, moving objects, or even your feet.
• Scent and scratching: Cats like to scratch cardboard and leave scent from their paws and body, which helps them mark the box as their own.

There’s also evidence that hiding places can help shelter cats feel less stressed and settle in more easily, which matches what many cat owners see at home.

Safety note: Remove plastic packing materials, staples, tape, and any heavy adhesive labels before letting your cat use the box.