A guinea pig pen is a designated space where guinea pigs can safely roam and play. These pens are typically made of wire or plastic and provide a secure environment to prevent escape and protect the animals from predators. They can vary in size and shape, allowing for customization based on the number of pets and available space. In addition to providing a safe area, guinea pig pens can be enriched with toys, tunnels, and hiding spots. This helps promote physical activity and mental stimulation, which are essential for the well-being of guinea pigs. Regular cleaning and maintenance of the pen are important to ensure a healthy living environment.