Among the design features built into the creation is that of avoiding over-eating of plants by herbivores or over predation of herbivores by carnivores. Sometimes there are surprising ways of keeping balance in nature.
Did you know, for example, that bears help control the production of caterpillars? A January 29, 2019, posting by Yellowstone National Park staff reports that Yellowstone bears in August eat an astonishing 40,000 moths a day. The moths are migrating from grasslands over the mountains in Yellowstone, and they are actually above timberline. This allows the bears to climb up and get easy nutrition as they prepare for hibernation in the coming winter. From an ecological standpoint, it limits how many caterpillars are produced, preserving plants for many animals in nearby grasslands.
One of the things science continues to learn about is how many factors are involved in keeping the balance of any ecosystem. The design of all ecosystems is so complex that knowing how many checks and balances are required is almost impossible.
Yellowstone National Park is one of our great American treasures. During several summers at Montana State University, we spent a lot of time wandering around this huge wilderness. Most people think of Old Faithful and the geyser basin when they think of Yellowstone, but the canyon and falls are some of Yellowstone’s most beautiful places.
What does it take to make a canyon like this, and what does this tell us about the history of the Earth? The answers to these questions are remarkably simple. You need something that is capable of cutting down through a material, and you need a material that can be cut. On planet Earth, the primary geologic cutting agent is water. When water is frozen, it gouges and cuts a wide U-shaped channel. This is called a glacier, and the shape of its canyon is easy to identify. In the liquid form, water makes a V-shaped channel like the Yellowstone Canyon. How long the channel is and how deep it is cut are determined by how much water flows, how long it flows, and how hard the rock is. In Yellowstone, most of the rock is geyserite, a soft yellow rock easily cut and eroded by water. This soft rock is produced by volcanic processes, and deep canyons can happen quickly when flooding occurs.