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Some fish, such as the whale shark (Rhincodon typus), are able to conserve their body heat when diving through sheer size.
The scalloped hammerhead has neither of these advantages or adaptations, yet has been tracked doing rapid, repeated dives to depths of around 800 metres.
Three scalloped hammerhead sharks captured off the Hawaiian coast were tagged with the device.
Body temperature remained constant for most of the dive until the final stage of their ascent back to warmer waters, when it would decline rapidly.
So far, scalloped hammerheads are the first fish found to do this, but Simpfendorfer says other sharks and fish might have the same adaptation.