Separating Lesser Sandplover from Greater can be problematic ESPECIALLY when dealing with a single bird- for me I use this simple rule one that provides a BASIC guide to ID for all ssp of both species. This works well on a square-on photo also note the eye shape and shape of angle of forehead
This is not foolproof
It involves working out the distance between the back of the eye to the foremost feathering where it joins the upper mandible compared to the distance on to the end of the bill.
For Greater Sandplover the ratio is almost equal - distance eye to bill same as bill length - bill has a dagger like tip
*plus nail is less prominent but almost half bill length and tip is pointed
For Lesser Sandplover the bill length is always much shorter
*plus bill is more robust and nail is more prominent but it is only around one third bill length - bill has a blunter tip
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