What beaked whales see at 1,000 meters deep?

Illustration for Oceana's event
 
Sowerby's beaked whale (Mesoplodon bidens, Zifio in Spanish), also known as the North Atlantic or North Sea beaked whale, is a species of toothed whale. It was the first mesoplodont whale to be described. James Sowerby, an English naturalist and artist, first described the species in 1804 from a skull obtained from a male that had stranded in the Moray Firth, Scotland, in 1800. He named it bidens, which derives from the two teeth present in the jaw, now known to be a very common feature among the genus. (Wikipedia)
 
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