Which animal can potentially injure its lungs by pressing down on its back and shoulders when handled?

The correct choice highlights the vulnerability of the guinea pig when handled improperly. Guinea pigs have a unique physical structure and a relatively delicate skeletal system. When pressure is applied to their back and shoulders, such as when they are squeezed or held too tightly, it can lead to serious injury, including lung damage. This risk arises because their ribcage is not very flexible, making it difficult for them to breathe if they are subjected to undue pressure.

Guinea pigs are also prey animals and can become very stressed when being handled. If they feel insecure or are held in a way that constricts their movement, it can exacerbate the risk of injury. Proper handling techniques are essential for their safety, emphasizing the need to support their entire body, particularly their back end, to prevent any harm.

Other animals, while they also require careful handling, do not possess the same level of risk regarding lung injury from this type of restraint. For instance, chinchillas, rabbits, and gerbils have different anatomical structures and handling requirements, making them less prone to lung injury under similar circumstances. Proper education on handling techniques for guinea pigs is crucial in a veterinary setting to avoid any potential health issues.