The hummingbird feeder was empty! I left it that way overnight because it was too dark to clean and refill it last night. First thing this morning, a hummingbird came by and noticed the deficiency. It hovered down to eye level with Hilo (a cat) who was crouched on the other side of the screen of the porch, waiting for a chipmunk or squirrel to come by. They stared at each other for quite a while. I understand why the bird thought the cat was in charge of things around here 😹