The Right Whales have an immense mouth, caused by an extremely arched superior jaw, inside which there are some extremely long beards. These beards are bigger than a tall person: an adult could fit, standing with his/her arms spread out, inside the mouth of a whale.
The whales swallow tons of sea water, then close their mouth and draw all the water from the mouth, filtering it with the beards. Large quantities of food, such as plankton and other microorganisms, remain trapped in the “beard”, and are withdrawn by their huge tongue.
In the waters of the Peninsula of Valdés one can watch for hours on end how the whales swim and feed continuously, absorbing tons of water.