Imaginary zoos with real badgers

From John Berryman's strange 1945 story "The Imaginary Jew" (Kenyon Review via twitter):

Now and then I went to the zoo in lower Central Park and watched with interest the extraordinary behavior of a female badger. For a certain time she quickly paced the round of her cage. Then she would approach the sidewall from an angle in a determined, hardly perceptible, unhurried trot; suddenly, when an inch away, point her nose up it, follow her nose up over her back, turning a deft and easy somersault, from which she emerged on her feet moving swiftly and unconcernedly away, as if the action had been no affair of hers, indeed she had scarcely been present. There was another badger in the cage who never did this, and nothing else about her was remarkable; but this competent disinterested somersault she enacted once every five or ten minutes as long as I watched her,—quitting the wall, by the way, always at an angle in fixed relation to the angle at which she arrived at it. It is no longer possible to experience the pleasure I knew each time she lifted her nose and I understood again that she would not fail me, or feel the mystery of her absolute disclaimer,—she has been taken away or died.