[Pepper]

It's possible you've got some hungry orioles in addition to your hummingbirds. Take a peek and see if any of the openings on the feeder have been "widened" somewhat. It's also possible that another type of critter has gotten access to the feeder, and drank it dry. I've seen bears, racoons, and squirrels all figure out how to do this.

Of course, it's still entirely possible that the hummingbirds have returned in huge numbers and are extremely hungry after their trip.

Keep us posted with what you see hanging around the feeder!