Many wildlife shooters overlook the small E 55-210mm F4.5-6.3 OSS lens. On an APS-C lens it has an equivalent focal length of 315mm and is surprisingly sharp. Matched with a 24 Megapixel sensor it also captures files that can be cropped generously to frame tight. I have posted a Flickr gallery of images captured with this pocket rocket:
https://www.flickr.com/photos/markgaler/sets/72157651634812438/