Sea otters have been seen submerged for up to five minutes at a time. River otters can hold their breath for up to 8 minutes.
The lung volume of an otter is 2.5 times bigger than that of other terrestrial animals of comparable size.
According to a research that was published on June 13 in the journal Science, myoglobin, a positively charged oxygen-binding protein, is found in the muscles of diving animals including beavers and muskrats as well as whales, seals, and otters.
They have to rise to the surface in order to breathe if they are submerged. They create openings so they may emerge to breathe if the water freezes over during the winter. They can dive below 36 feet and hold their breath for up to four minutes.
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