Ingrid (my cat) waits until I'm awake (very polite) & then pesters me to feed her, yapping almost continuously & getting underfoot until I feed her.

If Louie (my rabbit) runs out of water or food, he stands in the door of his cage (which is always open, although he's pretty lazy & rarely ventures out--kinda worried about that, actually) and stares at me when I'm in the room, with his ears forward & very intent--like "WELL. . . ?" If I don't notice he'll start banging around with his food dish in there.