Nieve's disapproving glare, often seen when she is hungry
Nieve is usually sweet but if she's hungry (which, when you have a tiny little stomach, is often) her sprite-like cuteness gives way to a cranky little monster. When this happens Nieve lets out sharp yelp followed by red-faced crying and an agitated scowl; it is a distinct mark of impatience. In contrast, when Ronan was hungry he would simply start smacking his lips loudly until we offered him food.
How Nieve sounds when she's hungry... although the volume of her complaints seems to be increasing since this video was taken