The gemara כל מה שברא הקב"ה בעולמו לא ברא דבר אחד לבטלה, all that Hashem created in His world, He didn’t create even one thing needlessly. The following fascinating account illustrates this idea perfectly.
Yellowstone National Park was established in 1872 by President Ulysses S. Grant. By the early 1900s, the ecosystem was unraveling. Wolves, seen as threats to livestock, were hunted to extinction in the park by 1926. Without the threat of the wolves, elk populations surged, leading to overgrazing that damaged vegetation which caused entire species to disappear. In 1995, everything began to change. A small group of 14 wolves was reintroduced into Yellowstone from Canada. Their return set off a powerful ripple effect: elk numbers dropped and moved away from sensitive areas, allowing trees like aspen and willow to recover. As vegetation returned, birds and beavers followed. Beavers built dams, creating habitats for otters, muskrats, and various reptiles. The wolves also reduced coyote populations, allowing mice and rabbit populations to grow, which attracted red foxes, weasels, badgers, and hawks. What started as a small reintroduction ended up reshaping an entire ecosystem—and even the land itself. Even the rivers changed—stabilized by new plant growth. Channels narrowed, more pools formed, and the rivers stayed more fixed in their course. This small pack of wolves transformed an entire ecosystem, giving to Yellowstone in addition to a huge ecosystem new balance, a changed physical geography. Wolf-watching draws thousands of visitors each year to Yellowstone National Park to watch the wolves and brings over $80 million annually to local economies around Greater Yellowstone.
