If a tree is being chewed on by a beaver at night, you might hear a distinctive sound that can be described as a series of rhythmic gnawing or chewing noises. Beavers have strong incisor teeth that they use to cut through tree bark and wood. As they chew on the tree, you may hear the repetitive sound of their teeth grinding against the wood, creating a distinct pattern of scraping and crunching.
The intensity and volume of the sound can vary depending on the size of the tree, the proximity to your location, and other ambient noises in the surroundings. The sound may also be accompanied by the rustling of leaves or branches as the beaver moves around or climbs the tree.
It's worth noting that beavers are primarily active around dawn and dusk, so if you hear these sounds at night, it's more likely to occur during these periods rather than throughout the night.