The Bar-ba-loots are a species of bears that live in the Truffula Forest.
The Bar-ba-loots are first seen when the Once-Ler comes to the Truffula tree forest. After briefly singing they tried to attack the Once-Ler but they calmed down when they tasted his marshmallows. They then watch in horror as he cut down the first Truffula tree and morn the loss of the tree with the Lorax.
Later that night after they helped the Lorax put the Once-Ler's bed in the water, they (along with the Lorax and other forest creatures) save the Once-Ler from going over the waterfalls. Later they watch in horror and sadness as the Once-Ler (under the influence of his greedy and lazy relatives) cuts down all the trees causing them to lose their food supply (the Truffula Fruits). After the last Truffula Tree is chopped down the Lorax sends them and the other forest creatures off to find another place to live.