She is my brother's rabbit. On nice days she would rather be outside in the cat yard (I can't say I blame her). When she is outside her cage is left open and for some reason is a big attraction for the cats.
In it. On it. By it. They just love it.
I think it has something to do with the heat of the sun reflected off the black bottom of the cage but who knows. They like it and that all that matters.