Kangaroos are able to breathe while they hop thanks to a number of adaptations. One adaptation is their large, powerful lungs. These lungs allow them to take in large amounts of air, which they can then use to power their hopping movements. Another adaptation is their efficient circulatory system. This system allows them to quickly and efficiently deliver oxygen to their muscles, even when they are hopping at high speeds. Finally, their thick, leathery skin helps to protect them from the sun and heat, which can help to reduce the amount of water they lose through sweating. All of these adaptations together allow kangaroos to breathe effectively while they hop.