A wildlife survey in Finland has found that by felling trees and building dams, beavers increase the diversity and abundance of woodland mammals
Source:
https://www.newscientist.com/article/2208573-beavers-engineer-their-ecosystems-in-a-way-that-helps-moose-and-otters/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home