There is an interesting article in the NY Times about wildlife art, and specifically at the National Museum of Wildlife Art in Jackson Hole, Wyoming. Titled The Prowess of the Painter in a Hunter's Paradise, critic Edward Rothstein's story is also a somewhat melancholy look at the vanishing wildlife that inspires wildlife artists. Rothstein also makes mention of the varieties of wildlife art (sport, scientific cataloging, etc.) and the history of wildlife art and the driving forces behind it. It's a good - and educational - read.
One of the best collections in the Midwest of wildlife art can be found here in "our own backyard," at The Ella Sharp Museum in Jackson, Michigan.