Hemingway and the Beasts, by Jens Bjorneboe, is an essay exploring animal symbolism in Hemingway’s works.
Update (June 2020): When I originally published this post, it included a link to a Norwegian translation of Bjorneboe’s essay, which was hosted on someone’s AT&T personal webpage. That website has since disappeared and I have been unable to find another copy of the essay. Please let me know if you find one.