Diving Tern

Spent a hour or two looking in the Ythan Estuary for the King Eider which I saw a couple of days ago but the tide was very high and all the eiders were out of the water and distributed along the length of the estuary. So I had a look at the diving terns and managed to capture a common tern, I think. Used my old 40D and Sigma 50-500 which is still capable of getting some reasonable images -sometimes.