What birds should we be paying more attention to....
Given the fairly recent discoveries of a possible "Siberian" Oystercatcher and an American Horned (Shore) Lark in the UK, and also the American White-Winged Crossbill in Iceland what other birds should we maybe looking a little closer at? Surely the American equivalents of Moorhen and Goosander could potentially be overlooked or even ignored completely if they turned up somewhere. What else 'exotic' might be hiding in plain sight?
I've got both the excellent Birding Frontiers Challenge series books and they are great for flagging up possibilities, however slim the chances may be, but what species/subspecies might have featured in further volumes?