Help Please!

Hi again, I was photographing at Coombe Abbey this morning and suddenly out of the corner of my eye a very little bird flashed bye. I waited patiently about an hour and then saw it was collecting for a nest in a bunch of reeds on the side of the lake. Once I had got bird, nest and the sun in some sort of order the photos followed but it was very fast, even at 11 shots a second it was out the nest and gone and the other way round all you get is whirring wings and rear end.

However perseverance paid off and well over 150 shots latter I had two that are viewable but now I don't know what it is. So once again guys your expertise is needed.

Thanks million! David . . . . . .

 

 

 

 

 

PS ~ It is the same photo I have just cropped it a bit, the other shot is almost identical!