BBC: Jumbo squid have developed a novel strategy that allows them to maintain a super-charged predatory lifestyle. After spending the night hunting fish near the surface, the squid dive into deeper cold waters to rest. To survive in these depths, where little oxygen remains, the squid shut down their metabolism, before cranking it up to rise and resume their hunt. The discovery explains for the first time how jumbo squid survive in these deep water dead zones. Details …