Identification Websites

Some of these appear more authoritative than others - but they are not always the easiest ones to use! Beware of purely photographic identification, because individual examples vary - sometimes considerably - and photographs do not always show crucial ID features. Unless you are dealing with a really authoritative site there may also be miss-identifications. Check everything via multiple sources seems to be a good rule. None of these probably substitute for knowing your way around a respected field guide in the form of a book - but how many books could you carry?

Please contribute your favourite identification websites.