Well (contra Anthea) I wouldn’t say that is the best way. That is one of many features and relies on a side view. It depends on the viewing (or even the hearing) and whether it is perched or flying. From a flying below view, apart from the significant different in wing markings (which probably could not be picked by David) and wing tip spread, I’d suggest the best way is tail shape, long and always a rounded tip in the Whistling Kite and square to fan shaped in the Little Eagle. Most field guides cover these points, the new book by Stephen Debus covers these things best (because it is just about raptors). I don’t know the current status of either species there but I don’t recall seeing either, in my many years in Box Hill and surrounds. David mentions “The square tail” and if that is certain, it rules out Whistling Kite. (Don’t claim it as a Square tailed Kite unless other features match that.)
Philip
