Can anyone advise please? We have 2 girl piggies, bought for DSD for Xmas. I keep reading how they're friendly, and squeal when being fed. But ours don't. They run and hide when we approach, and we have to chase them around the hutch when we try to pick them up. I am inclined to persevere with handling them so they get used to it, but equally don't want to stress them. They just don't seem to be the friendly pets that I have read about ...