Grey Plover with Dunlins
There is clearly some kind of lesson going on, but what is the teacher and what are the pupils? A plover and some sandpipers?
Thanks to Buckeye, I think these are a Grey Plover with some Dunlins.
I cropped some of these, so will admit it (for the ones less than 3000pixels on their longest side) down here in the bit noone reads ;) Longest side on the original of this is 1999 pixels