What animal would drink hummingbird feeder dry?

I am in NE PA and have always put out the red nectar for hummingbirds. Two nights in a row, feeder was bone dry in the morning; no leakage.
What local wildlife might do this?

At nights Bats, usually when a hummingbird feeder is full when night time comes, and empty by morning, one has to wonder what animal was in the hummingbird feeder at night? The answer is usually bats.

OTHERS DURING DAY AND SOMETIMES AT NIGHT
Ants: Ants in a hummingbird feeder is a big problem. The ants will come in to steal the nectar from the feeder while bringing with them disease and contamination.

Bees: Hummingbird feeders and bees. What a dilemma. The hummingbirds really do not like to share the feeders with bees. Bees do not like sharing a feeder with hummingbirds.

Wasps, Hornets, Yellow Jackets, and Other Flying Insects: Keeping wasps, hornets, yellow jackets and other flying insects away from hummingbird feeders is very important. These insects are very aggressive and have been reported to go as far as to aggressively chase and sting hummingbirds.

Squirrels and Other Animals: Squirrels, Raccoons, Bears. How do you keep them out of hummingbird feeders? This is an age old question and we have a few answers that may be helpful.

Orioles and Other Birds: There are other birds, like orioles, that love nectar just as much as hummingbirds. Orioles are notorious hummingbird feeder raiders.
http://www.worldofhummingbirds.com/uninvited.php

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