Baleen whales are heavy drinkers. In just ten seconds, these giant mammals can down over five hundred bathtubs of ocean water, filtering out roughly 10 kilograms of krill in a single swig.
The pressure of all that water rapidly hitting a whale's throat would surely be immense. So how does this group of creatures – which includes right whales, the humpback whale, and the monumental blue whale, amongst several others – make sure their lungs aren't suddenly flooded with water?
No such structure has ever been identified in any other animal, but the authors suspect it is probably present in other lunge-feeding whales , like humpbacks and blue whales. In humans, a flap of tissue known as the epiglottis, covers the path to the lungs when we are eating so we don't accidentally inhale our food.
When they are eating, however, this fatty plug has to swing up and back, shutting off the path to the whale's upper blowhole, while opening up the esophagus for swallowing.
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