The beavers at Woodland Valley Farm in Cornwall continue to expand their world, felling trees to drag into the water and build their dams. These then sprout again, providing leafy green for them to eat - beavers are farmers like us and coppice their trees. Meanwhile, the light gets into the woodland and lots of other plants bring to life, animals come to drink and graze, fish grow bigger, and insects breed, feeding the birds. So don't worry; we lose a few trees and gain a lot more.