ok so yam's parents being huge on animal rescue and they have a house full of animals. dogs, cats, rodents, birds, fish, reptiles, they've got em all. every day when the two of them get home from school they get mauled by three dogs, a macaw, five ferrets, two cats, a goose, a monitor lizard, and a pig before they can even take their shoes off - potion seller (bonus: yamaguchi carries around sugar gliders in his pockets always and the birds all flock to tsukki like he's a living playground)
actually that pet shop sells everything, to the point where I go in there and say “what the fuck kind of animal is that?”. scorpions, tarantulas, chameleons, degus, sugar gliders, albino hedgehogs, massive goby pond fish, some kind of big caterpillars, hissing cockroaches, ropefish, hermit crabs, pixie frogs, massive yellow boa constrictors….youre not allowed to take photos and the door is manned by a Pekingese, an ancient bulldog with cataracts, and THE BIGGEST DOG EVER. there’s also macaws and cats wandering around.
To add onto the Tanked post, they also keep large birds in the building they build the tanks, near hazardous equipment and fumes that could potentially kill the birds. All in all; Birds don't belong there and it's a hazard to their health.