There is probably a permanent family of Great Horned Owls living in High Park.
I visited the park on a rainy and dark morning hoping to get a photograph of one of these residents.
When I was just about to give up, the loud and raucous calls of two Common Ravens filled the air.
The ravens had found a Great Horned Owl and seemed intent on bullying it out of its roost. I doubt if this ever does more that irritate the owl.
I read that Great Horned Owl hunting tends to peak between 8:30 pm and midnight and then can resume from 4:30 to sunrise. By the middle of the morning they need some sleep. After about ten minutes the ravens gave up.
Entertaining singing bird
If you sit down at set of sun
And count the acts that you have done,
And, counting, find
One self-denying deed, one word
That eased the heart of him who heard,
One glance most kind
That fell like sunshine where it went —
Then you may count that day well spent. – George Eliot