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.
All they have to do is open their mouths and lunge forward at roughly 10 kilometers an hour (6 miles per hour).
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?
The dissection of several fin whales (Balaenoptera physalus) has now revealed a fatty and muscular sac that stops the species from choking. When the whale opens its mouth to feed, this sac swings upwards and plugs the lower respiratory tract.
No such structure has ever been identified in any other animal, but the authors suspect it is probably present in other lunge-feeding whales (called rorquals), like humpbacks and blue whales.
"There are very few animals with lungs that feed by engulfing prey and water, so the oral plug is likely a protective structure specific to rorquals that is necessary to enable lunge feeding," explains zoologist Kelsey Gil from the University of British Columbia, Canada. READ MORE...
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