Hoverflies of Britain and North-west EuropeThe most complete photographic field guide to hoverflies of Britain and North west Europe ever written. An essential part of our ecosystems, hoverflies are the second most important pollinators after bees. Sadly, more than a third of all European species are now under threat of extinction. Written by two leading experts, Hoverflies of Britain and North west Europe is the first and only photographic field guide to cover all 400 hoverfly species