A scalloped hammerhead shark (Sphryna lewini) eyeballs the photographer outside the Shark Lab at the Hawaiʻi Institute of Marine Biology in Kāneʻohe, Hawaiʻi. Photo courtesy of UH/Mark Royer. Cold-blooded scalloped hammerhead sharks (Sphryna lewini) keep themselves warm while diving into deep, cold water off Oʻahu, suggesting that the species might be holding its breath during [...]
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