Smell and taste
Odours travel slowly in water and cetaceans move too quickly to use this sense efficiently. For this reason, they lack the sense of smell… with one exception: in 2011, researchers revealed that bowhead whales had the ability to smell. They believe that bowheads use their olfactory sense to “sniff” the air in search of krill. Whales can also taste what they eat. They even use taste to distinguish water masses based on their salt content.