Just after I'd taken the picture of the Rook, I noticed a lot of Sand Martins (and a single Swallow) flying past me. They circled round and went back to the cliff.
So I stood there trying to get a picture... ha ha!! Then my sister called me over. She was at the edge of the cliff!! She was looking sideways down to the cliff face where there were a lot of Martins flying in and out of nest holes.
I tried zooming in, but that was hopeless my reactions weren't quick enough, so took some wide angle shots instead!
It did mean I had to do quite a big crop in the end. But this camera does give me enough pixels to do so I think.