Sharks may not have lungs, but they can still hold their breath. As they hunt squid in deep water, hammerheads seem to avoid plunging body temperatures by clamping their gills shut
Scalloped hammerhead sharks prevent their body temperature dropping on deep-water dives by closing their gillsScalloped hammerheads appear to hold their breath when they dive into cold, deep water. By shuttering their blood-rich gills, they may keep warm while hunting prey, effectively sidestepping their own cold-blooded biology.at the University of Hawaiʻi at Mānoa. The dramatic descents may be for hunting, since the beaks of squid from the visited depths have turned up in the sharks’ stomachs.
“You should expect to see their body temperature drop right away,” says Royer. “But that’s not what’s happening.”
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