One example: In Alaska, There is a reduction in permafrost, leading to a boom in trees, and a huge boom in beavers. The ponds they create warm the soil further and create more readily available water, which attracts other animals like muskrats and waterfowl. An entirely new ecosystem is being created. https://www.nationalobserver.com/2022/02/23/news/alaska-warming-tundra-beaver-boom