This is the Eurasian eagle owl (Bubo bubo). It has the orange eyes of a dawn and dusk hunter.
This is the snowy owl (Bubo scandiacus). Unlike the eagle owl above, the snowy owl is on the British List. This one is a young male in the process of losing the barring on his chest which will eventually become pure white. His native home is the Arctic tundra and he has insulating feathers around his beak and on his feet (which also come in useful in north Northumberland). His yellow eyes show he is a daytime hunter.
The only free-flying bird we met was a barn owl. Unlike a wild owl, it flies in a straight line close to the ground in a long dive between handlers, presenting a real challenge for my bird-in-flight photography skills, especially on a rather misty cloudy day. However, I did manage three photos almost in focus.