I have two Norwegain Forest Cats, brother and sister called Darcy and Pashabelle. They are now about 5 years old, and as we live in a town close to a busy road, they are "caged tigers" as I have enclosed the rear garden with green plastic netting of the sort you might fix to a wall to grow climbing plants such as clematis through.
This is supported by fibre glass tent poles, mostly and some bamboo, and firmly wired together and to the perimeter walls and house. It is defintely cat proof, although Darcy does try it on by walking suspended upside down across it.
One downside is that to prune the encroaching jungle is hard work, and involves shutting the tigers in the house. They are rather large and determined cats who even as kittens broke the catches on the catflap clean off, and they have an aversion to doors being closed. There are often howls of protest and scratchings when I have the temerity to close and lock the bathroom door for reasons of delicacy and privacy.
The result of this additional obstacle to pruning is that the ivy and other climbers are rampant, and ivy produces lots of berries which blackbirds are very fond of, and they ripen in the spring so as to be handy for feeding blackbird chicks.
So the blackbirds nest in the ivy, right on top of the cat caging, which in some cases they incorporate as the foundation. I would not think this a particularly good plan myself. Mostly they get away with it, as the ivy makes it difficult for Darcy, balanced precariously upside down clinging on with three paws, to reach to hoik nestlings out. Pashabelle watches and waits, and then wanders off.
The stupid thing is that the blackbirds can squeeze through to the inside of the cage, and occasionally do. Then they panic and in the confusion the inevitable happens, and there's a corpse left on the kitchen floor or at the foot of the stairs. Considering that Pashabelle sleeps for part of most nights partially on my pillow, I suppose we should be pleased that she doesn't park the corpse there.
And worst, Ma and Pa Blackbird seem to think that the inside of the cage is a great place to arrange first flying lessons for the sprogglings. Spring is sprung, and soon the cycle will begin again.
On the plus side, the newts are thriving in the pond.