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The Skeletal Rooster is seen crowing before the musical number, "Jack's Obsession".
Rooster
It's the only time it is seen in the entire movie.

As he seems to be entirely “functional” (being usually lethargic, and then rising and crowing to indicate dawn), and he resembles theSkeletal Reindeer in concept, it is possible that the Skeletal Rooster was created at some point in the past by Dr. Finkelstein, possibly at Jack's request.