I’ve noticed many precariously chewed trees left by beavers, making me wonder when and how they finish the job. To investigate, I pointed trail cameras on freshly gnawed cottonwoods. Beavers rarely chewed through the whole trunk. Instead, the risk-averse rodents often let the wind bring down teetering trees. The beavers paid close attention to noise when felling trees and dashed like scared sawyers at signs of cracking.