Around the world, animals work with other living things to create unique and balanced ecosystems. Bees help plants make seeds. Birds scatter seeds so plants can grow. Gophers loosen the soil, letting water and nutrients easily reach roots. Cleaner fish keep other fish healthy by eating parasites. But today, some of these systems are at risk of disappearing. Team Earth investigates the amazing ways that animals help their environments and humans, and shows what people can do to protect them.