Uh uh, Kaiya, callin' me out...alright then I won't be lazy, lol.
I third the question of have you ever had any pets anywhere? Unless a previous tennant was hiding animals, which is possible, it seems unlikely they're past occupants of the apartment. In that case bunnies would make more sense. What floor are you on and is there any green space around the building that bunnies could live in? It's possible the animals came from the outside, and in most cases cats are much more likely b/c they're more adaptable as far as terrain goes. Are there any housing places nearby where people could have pets? Considering they scared you, again I think cats are more likely than the rabbits to behave that way, although some bunnies can be aggressive. Could be cats chasing rabbits, lol. It's possible it was spirit cats/rabbits chasing away bad spirits for you.
What sort of radio show was it? Did you notice any more static than usual when this happened?
My personal experiences with spirit animals mostly involve working with them to chase off bad spirits. I accumulate them around my house for that reason, if nothing more than to alert me when something is off. Spiders, snakes, cats, owls, hawks, wolves, and intelligent dogs seem to be some of the most active spirit animals. Predators definitely appear to be the most common to run into. Maybe they like to practice their hunting skills on evil spirits while they sleep to keep them sharp? Or maybe consuming other creatures really DOES give you greater spiritual power, lol? We need to find some cannibals to ask how that works out for them since the consumption of other creatures in general doesn't seem to work for humans. Maybe there's one lurking in our midst?