High Energy Creature
Squid move by jet propulsion, which demands a huge amount of energy -- and squid have some of the highest metabolic rates in the sea. Jumbo squid, in particular, burn a lot of gas in their daily commute to the bottom of the sea and back. New research shows that rising CO2 levels and warming temperatures will affect the animal's energy levels. | Video: Colossal Squid Makes Giant Splash in Lab