The process of surfacing and breathing is automatic, and even a hippo sleeping underwater will rise and breathe without waking.
View moreThis is why hippo calves can suckle on land or underwater.
View moreThis means that we do not have the ability to breathe underwater.
View moreSea otters can hold their breather underwater for more than 5 minutes, and river otters can hold theirs for more than 8!
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