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Scuba diving at night in the surface waters of the Gulf of California in 2007, Seibel scanned the depths with his flashlight and saw the shadows of Humboldt squid far in the distance.
Seibel was surprised by the large number of squid he encountered, which made it easy to imagine how they could be potentially dangerous to anything swimming with them. Their large numbers also made Seibel somewhat pleased that they appeared frightened of his dive light. Yet he said the animals were also curious about other lights, like reflections off his metal equipment or a glow-in-the-dark tool that one squid briefly attacked.
Humboldt squid feed in surface waters at night, then retreat to great depths during daylight hours. "They spend the day 300 meters [nearly 1,000 feet] deep where oxygen levels are very low," Seibel said. "We wanted to know how they deal with so little oxygen."
Jumbo Squid Following Low-Oxygen Zone
You can think of jumbo squid as one of the early winners of ocean climate change, Gilly said.