"In winter, when food sources diminish, water voles (Arvicola amphibius) will peel and consume the inner bark of small trees and shrubs. Their digestive system is not strong enough to process the harder bark parts, so they efficiently peel the outer layers to reach the softer and more digestible cambium layer."

"Although the digestive system of rabbits (Leporidae) is not very strong, they have adapted a system that allows them to gnaw and eat tree bark during the winter."

"During the winter season, the North American porcupine (Erethizon dorsatum) often climbs trees to eat branches and the inner bark of various tree species. The porcupine's large intestine is very long, allowing for slow travel time through the intestinal tract which helps improve nutrient absorption."

"All species of deer in the Cervidae family can eat tree bark. This commonly occurs during the winter in arboreal environments. Deer are one example of ruminant animals, even-toed mammals that chew food that has been regurgitated from a stomach compartment called the rumen. Like cows, a deer's stomach is divided into four chambers."

The two existing species of otters, namely the North American beaver (Castor canadensis) and the Eurasian beaver (Castor fiber). They will peel and eat the bark of trees. Beavers primarily eat the bark of young twigs, the cambium of branches, and small tree trunks. This young and flexible bark contains less lignin.