The perfect guide to identifying common trees RSPB What's That Tree? is ideal if you struggle to tell the difference between a Serbian spruce and a Silver birch. It's the perfect pocket guide for beginners but also a handy reference for the more seasoned naturalist. Featuring over 150 common trees from around the UK and Europe, species overviews show you what to look for where and related trees are shown side by side for quick comparison and identification. Become an expert tree-spotter in time with RSPB What's That Tree?