Wildlife artist Robert E Fuller paints some beautiful studies of birds - and maintains a number of nest cams around his gallery.
A few weeks ago, he caught a pretty vicious bout that would put Mayweather and Pacquiao to shame.
Fuller recorded footage of a kestrel and barn owl fighting beak and claw over the nesting site, each battling to secure it. It's fascinating stuff for anyone who wonders what goes on in the hidden corners of the fields.
The fight takes a couple of short breaks as the pair circle each other, the owl keeping its back to the wall - but he clearly knows what he's doing, as he repels a vicious lunge at the one-minute mark.
In the end, the barn owl was victorious - and lucky for him. About two hours later, at 10.20pm, a lady barn owl came knocking. And after the initial shock, it's pretty adorable footage - helped a great deal by the way owls often look like they're giggling when they open their beaks.