I've got a dog after bird story for ya'll.
When I lived in Washington I had a German Shorthair that I hunted with just about every weekend during bird season. Very birdy dog but a bit of a knucklehead. I traveled a lot for work and boarded him at a kennel down the road that also doubled as a bird dog training outfit.
Sometimes they'd get pointers that just weren't interested in birds, they'd try different techniques to try and get them to get interested in hunting birds, but some dogs just would not work out no matter what they did. One of the things they tried is they'd put a live bird in the dogs kennel and leave it there - I don't know if that ever worked, but it was something they'd try.
The kennels the dogs were in were about 10' long and 4' feet wide. There was a concrete wall in that back that was 8' high and ran along the back of all the kennels. The side walls were concrete and maybe 3 feet high with chainlink on top. At the back of the side walls, there were chain link metal posts embedded into the concrete and there was a gap between the post and the concrete wall, the gap was just a few inches, maybe 3 inches.
So they put a bird in a dog's kennel that was 4 kennels down from the one my dog was in. Next morning when making the rounds they saw my dog was in the kennel of the dog they had put the bird in, he had eaten the bird and all that was left were some feathers.
The only way he could have gotten there was to squeeze through the gap between the posts and the wall, and he would've had to do that 4 times to cross over from his kennel to the one where the bird was located. How he could've gotten his head through that gap, let alone his body, is something that seems impossible, but that's the only way he could've gotten there, short of unlatching the kennel door going out and doing the same at the other kennel, and not only that, but remembering to close and latch the door behind him. The people that ran the place had never seen a dog do what he did, they were amazed.
I kept him outside in a chain link enclosure, he figured out how to squeeze through the gap in the door so I had to bungee that up. Then he figured out he could push through the bottom of the chain link. I'd get up in the morning and see him on the front porch, took me a while to figure out how he was getting out of the kennel without squeezing through the door, but I had a side window that looked out on the kennel and one day I watched him squeeze out underneath the fence - he yelped as he was doing it, but he made it. I got some wire wraps and wrapped that chain link to the bottom fence bar and that put an end to his escape antics.
He was a great bird dog, shot a lot of birds hunting behind him.