In length, the great grey owl. But the great horned is somewhat heavier.
Eagle owl (real name)
Eurasian Eagle Owl
no , the snowy owl is the biggest but people are assuming that the european owl is bigger.
barn owl
barn owl
no
Yes
The Teet-Owl
That depends on which type of owl that is.
The Tawny Owl
A Interster Owl
owl nest