Alan, you have to "close your eyes" to see properly!!! Here is my contribution to a unknown bird... I was actually looking for some sea birds in fly. This one came that big - I had to step 3 steps behind to get it in frame - not! )! I was with the prime 500mm.
And my second bird species from today: got it in the last few moments before it was not for the BIF topic!
Actually I was taking photos of flowers when I notice some commotion with my peripheral vision - got there little bit later but at least got something. Actually I don't know why I always ignore the Cattle Egrets in fly?