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You might have thought: Is dolphin a mammal or not? Even though these creatures live in the ocean all of the time, dolphins are mammals, not fish. Like every mammal, dolphins are warm blooded. Unlike fish, who breathe through gills, dolphins breathe air using lungs. Dolphins must make frequent trips to the surface of the water to catch an important breath, indeed.
Whales and dolphins are mammals and breathe air into their lungs, just like humans do. They cannot breathe underwater like fish can as they do not have gills. This allows these creatures to take breaths by exposing just the top of their heads to the air while they are swimming or resting under the water.
Dolphins are able to hold their breath for several minutes but typically they breathe about 4 or 5 times every minute. Deep-diving whales such as sperm whales or Cuvier’s beaked whales may go well over an hour between breathes.
Dolphins generally sleep at night, but only for a couple hours at a time; they are often active late at night, possibly matching this alert period to feed on fish or squid, which then rise from the depths.