Vampire squid
The Vampire Squid is an extreme example of a deep-sea cephalopod. People think it lives at aphotic (lightless) depths from 600 to 900 metres (2,000-3,000 feet) or more. Within this region of the world's oceans is a discrete habitat known as the oxygen minimum zone (OMZ). Within the OMZ oxygen saturation is too low to support aerobic metabolism in most higher organisms. Nonetheless, the Vampire Squid is able to live normally in the OMZ at oxygen saturations as low as 3%; something no other cephalopod—and few other animals—can do.