Walton Ford, “Zürichsee” (2015), watercolor, gouache, and ink (photo Natalie Haddad/Hyperallergic) New York’s art world is a zoo this summer. Well, not quite, but animals populate some our favorite shows right now. Walton Ford’s “birds and beasts” (in the words of the exhibition’s title) are a wild counterpart to the playful dogs, cats, and bears…