The water the whale needs is pulled from the food itself. The krill (and other food sources) aren't just sticks of salt as they have bodies able to filter out the salt. The whales then need to consume large amounts of them to get their caloric / water needs.
The water the whale needs is pulled from the food itself. The krill (and other food sources) aren't just sticks of salt as they have bodies able to filter out the salt. The whales then need to consume large amounts of them to get their caloric / water needs.