If they can remove the bark and get to the sap, it contains water, dissolved sugars, and other nutrients that are good for their diet. If you're going to be feeding the squirrels in your backyard, you should consider feeding them the most nutritional brands that are packed with nutrients they need. We are here to educate everyone on all pets concerns. Squirrels enjoy all kinds of vegetables so they can be a nuisance in your garden. This is done to store food for the long winter months. When bark is removed from trees, the cambium layer with sugars and nutrients is exposed. No bird food attracts more species of birds than Jims Birdacious Bark Butter. Why They Won't Leave Trees Alone Squirrels like to strip the bark from thin-barked trees because such bark is easier to remove than thick bark. However, its not uncommon for them to strip bark or chew branches from the following trees.