There is something known as a cave angelfish that resides solely in cave waterfalls. They use microscopic hooks on its fins to hang onto the cave wall, and intercept nutritious particles that are literally falling on top of them in the waterfall. As far as we know, they only exist in two individual waterfalls, both in Thailand.
Schools of dolphin work in teams to drive shoals of mackerel towards the surface of the water, trapping them. Waiting above, sea birds pick them off, diving up to 20 meters down into the waters. An efficient system. The birds would not eat without the help of dolphins. And at the end of the day, the mackerel are still great in number.
The rainforests are a powerful demonstration of the 80/20 principle. They cover only 3% of the surface of the earth, but contain more than 50% of all known species of animal. And millions of species of insect -- we have no idea how many exactly.
The tropical rainforests are also the most balanced ecosystem on the planet. There is an animal, plant, or fungus to fulfill every possible role. Everything works in perfect harmony.
When you think about money, our global economy is a pathetic parody of the real global economy that has been going on for millions of years, long before we reared our ugly mugs.