Knot often associate with freshwater areas, particularly near the coast. One was roosting on the opposite rocky-bank of the middle pond, we couldn't recall seeing one over there before though.
Black-tailed godwits are quite regular visitors to the upper millpond, perhaps less so to the two other ponds. It was nice to see two of them feeding below the Castle ramparts. Both were so tame that anyone wanting to study the plumage subtleties of these rather fine and elegant waders wouldn't really need a telescope.