This sperm whale has just come up to breathe, after foraging for prey in deep water. There is a small piece of squid visible, attached to the whale's top left jaw. It is very likely a piece of Architeuthis giant squid, which seem to be relatively common in the deep waters adjacent to the Ogasawara island chain of Japan. There are also scars made by suction cups of squid feeding tentacles visible on the forehead of the whale. Those suction cups are lined with finely serrated rings of teeth made of chitin.
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