"Dab-Dab. Jip. Gub-gub," says Bella. "It's almost like onomatopoeia - for a duck, a dog, and a pig - but since the animals talk perfect sense as far as the Doctor is concerned I don't know why that would be how they're named. It doesn't seem like it could much distinguish them from other ducks and dogs and pigs, does it? Even if they wouldn't use human sounds they could use words. The parrot talks English," she adds, "and is named Polynesia. For some reason. I don't even know if there are parrots in Polynesia."