Bears have much in common with people. We're both mammals. We're both omnivores. We are protective of our young. Also, if a bear happens to lose something very important, they will search for it. Especially if that something is their hat.
I Want My Hat Back by Jon Klassen is a clear-cut observation of a bear in his natural habitat, asking other animals if they have seen his missing prized possession.
What that description did not tell you is how unbelievably charming and oddball Klassen has made this story. Bear, standing upright, interrogates a different animal. Nearly every conversation is alike. No one has seen his hat and bear retorts, "OK. Thank you anyway." before he goes on to the next creature. The whole thing reads like a classic comedy bit.