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Many marine mammals, such as the bottlenosed dolphin, Tursiops truncates, the killer whales, Orcinus orca, the beluga, Delphinapterus leucas, and the California sea lion, Zalophus californiaus, are known to produce so-called squeaks and chirps.
In all marine mammals, the period of lactation is particularly stressful to the mother’s water balance.
In Chapter 10 of “Mammals of the Sea: Biology and Medicine,” Sam H. Ridgway reports that the milk of both cetaceans and pinnipeds is very rich (high in fat and low in water content), which minimizes the water loss.
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