"Research has shown that even a slight increase in water temperature can make the animals balloon in size. This is because their digestive enzymes work faster when warm.
"For cephalopods, temperature appears to be an accelerator," said Forsythe.
Jackson recently estimated the total body mass of the animals has already exceeded that of humans on Earth. Past research has suggested that sperm whales alone consume more than 100 million tons of squid every year. Jackson reasons if that estimate just covers squid eaten by one predator species, then their total mass must exceed that of humans, which represent half of 1 percent of the total biomass on Earth, according to the World Wildlife Foundation."
