Walt Disney World employs around 60,000 human Cast Members. But millions of other creatures help play a part in maintaining the guest experience. Have you ever wondered why there are so few mosquitoes around to bite into guests, despite the fact that the entire resort was built on swampland?
Very interesting video (though maybe dry for students) about permaculture (long-term perennial) garden in Vietnam. This 300-year old garden provides all manner of food for its owners and livestock and likely all manner of wild animals too. Its a highly productive, low-impact version of agriculture and landscape design.