Walked from the reserve to Sherpa late morning, still no sign of a Common Sandpiper but near the reserve a large, pale-ish bird of prey flying away from me lifted up to reveal a white rump. Female type Hen Harrier. Turned to look at he other bird of prey over the reserve to see it was the female Marsh Harrier. Later went over to the Skern and confirmed that 2 Snow Buntings were indeed between the 7th and 8th Tees. Hard to find, but eventually saw them at the top of the pebble ridge under the low sand ‘cliffs’. Coming in on the rising tide were 2 great Northern Divers and later 4 Eider. Long time since I’ve seen an Eider in the estuary.