This is only a short answer space. If I understand correctly, you are looking for a thesis statement linking the natural world to Cole's experience on the Island. I can give you a general idea on your thesis but I can't write your paper. Example:
In the novel Touching Spirit Bear, the author Ben Mikaelsen cultivates a connection between the protagonist and the Alaskan wilderness. Three animals he uses to develop Cole into a dynamic character are the sparrow, the Seagull, and the Spirit Bear.
Then deal with each animal in a separate paragraph. Make sure you explain and quote.