They do loads of cute things, like..
"getting large" - that's what we call it, when one of the pigs (usually Shirley, but Beyonce has started recently) does this funny little shuffle with her back legs and makes this rattling noise. Apparently it's something to do with mating, which is a bit odd with two girls. Mind you, I think Shirley attempted to hump Beyonce a few times, when she was quite young. Then, once the pig has finished getting large, she nuzzles the other pigs face, which usually causes the other pig to run off.
Sometimes, she'll chase her, sometimes not.
One of the pigs will keep lunging at the other one, in a face off stylee, which I think is some attempt to get the other one to chase her.
They're really funny when they chase each other around the cage. But it's even funnier when one just gets it in her head to run like a fruitloop around the cage, whilst the other one looks on totally bemused.
They also push their tubes out of the way, which makes me wonder whether I should buy them some toys to play with. I think they might headbutt stuff if I suspend it from the roof of their cage..?