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A white heron in the UK is likely to be a Little or Great White Egret, but occasionally Cattle Egrets turn up.
A black, reptilian-looking bird swims by low to the water - but is it a Cormorant or a Shag?
A stocky brown bird rockets up from just in front of your feet, but is it a Common Snipe, or its rarer relative Jack Snipe?
On paper Lesser and Great Black-backed Gulls are straightforward to separate but, in reality, many of us struggle.
Harriers are stunning, lithe and elegant birds of prey. Two species of grey harrier are regularly found in the UK, Hen and Montagu's.
Two species regularly found in Britain and Ireland - their ranges and habitats overlap, so how can we tell them apart?
A sudden view of an elegant falcon in summer, but is it a Hobby or Kestrel?
Collared Dove is one of our most familiar species, but how can you confidently separate it from the rarer Turtle Dove?