00:03fish can breathe underwater that's sort of their thing dissolved oxygen in the water is pulled
00:08from their surroundings via their gills but now experts say one fish is actually able to hold its
00:13breath and they think they know why according to researchers some species of hammerhead sharks
00:17close their gills when they dive into particularly deep waters effectively holding their breath as
00:22they move lower and lower and into cooler and cooler water while hunting letting them maintain
00:26body heat as they do so that's because the scallop hammerhead shark is cold-blooded meaning it
00:31doesn't produce its own body heat so it has to make up for diving from warm surface waters down
00:36into the cold depths below and maintaining body heat is extremely important for maintaining high
00:41metabolic function something biologists say is extremely necessary while hunting post-doctoral
00:46researcher in shark physiology and behavior mark royer told nature quote the most rapid point of
00:51heat loss for any fish even a high performance fish is always at the gills as they are essentially just
00:56giant radiators strapped to their heads and scalloped hammerhead sharks would definitely need any help
01:00they can get as they're known to hunt at depths of more than 2600 feet
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