In 2014, an exhibition of watercolours by the renowned avian artist, John James Audubon, opened in New York. The reviews, from the New York Times to the Guardian, were unambiguously enthusiastic, celebrating the painter as a legendary genius who ‘exceeded the limits of his era’. Fast forward eight years, and a rather different vibe hangs over the latest outing of his bird portraits, one that reflects both the limits of that era and the limits of the man.