Just recording that there is still a handful of owls left at the zoo. There are two snowy owls next door and there might be one or two owls behind the lions and tigers (not looked for a couple of weeks and won't be able to do so until December now).
The ones on the right are juveniles halfway through transitioning into adult plumage see, for instance, this photograph of another juvenile at Twycross:
Thankyou, TLD, for highlighting my inferior photo But, as I told myself while struggling and failing to focus through the wire, it was for record purposes only