For the U.S., Kerry is to sign the agreement Friday and then President Obama will ratify it before he leaves office in December, a senior U.S. official told CBS News in a conference call this week.
Time Frame. The average dolphin species can stay underwater for as long as eight to 10 minutes; some can remain submerged while holding their breath for 15 minutes. Dolphins breathe through their blowhole, which has a muscular flap that covers it when they go under water, keeping water out of their lungs. Size.
Image caption Harbour seals routinely hold their breath for 30 minutes and even sleep underwater. Nicholas Pyenson, curator of fossil marine mammals at the Smithsonian Institution in Washington DC, said that the study was an exciting advancement for understanding the evolution of deep-diving.