Water water everywhere! Any to drink?

摘要

Most animals are made up of more than 50% water. This means that getting water and keeping the right amount in your body are paramount to staying healthy and functional. For species that live in the ocean, however, maintaining the right balance of water inside the body can actually be pretty tricky. The salt in seawater draws freshwater out of the body via a process called osmosis, presenting a real challenge to marine mammals that need that fresh water to stay hydrated! Marine mammals might be able to overcome this challenge because of their unique physiology that helps them maintain the water levels they need inside their bodies. But, the water has to come from somewhere.