Visible crew/equipment: After Batman and Catwoman's mistletoe banter, a wire can be seen attached to his back as he glides off the rooftop. (01:20:15)

Batman Returns (1992)
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Directed by: Tim Burton
Starring: Christopher Walken, Michelle Pfeiffer, Danny DeVito, Michael Keaton, Michael Gough
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Question: Why is Penguin's blood green?
Chosen answer: It is part of the mutation that caused his peculiar appearance.
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Answer: It isn't. If you look at when he dies you will see that he has cuts on his face that are bleeding red. The blue liquid is more like a bile, probably similar to saliva.
What about when he emerges from the water and green blood comes out of his nose and then his mouth?