The book in a way is really about learning to be yourself. I think when children read it they will understand it's hard to reach your potential and to find what your talents and abilities are and to use those abilities. But Bartleby does it and grows stronger and stronger as he faces each obstacle and learns to overcome them. He has community. He finds other animals.
Animals do have communities and get along with others.
Obviously, they have natural enemies as well. I did research on who eats turtles. And small turtles fall prey to anything with a mouth large enough and teeth sharp enough to eat them. But as they get larger they have very few enemies. Bartleby is small.