Guinea pigs have a kind of wheek that they use with each other (i.e. if one pig is showing submission to a higher-ranking pig), but it's not exactly the same as the food wheek. While not all pigs wheek for food/attention, some of the ones that do have a REALLY demanding tone to it! One of our past pigs (Hadley, in my avatar pic) used to wheek for food and then wheek louder if the food was taking too long showing up, and she was really insistent about it!