When the landscape is attractive, incorporating it into your wildilfe photography is a great idea. The Canon EF 100-400mm f/4.5-5.6L IS II USM Lens is my go-to lens for this scenario. The focal length range keeps both the animal and the background large in the frame and provides plenty of framing flexibility.
A partly cloudy day sometimes provides ideal lighting. This image was captured just before the shadow of a cloud reached the bull elk, leaving the surrounding background dark, helping the bull and its antlers stand out.
A larger version of this image is available on Flickr.