Ocean Life Facts

The average ice berg weighs 20,000,000 tons!

A blue whale's aorta (the main blood vessel) is large enough for a human to crawl through.

A bluefin tuna can swim at speeds up to 40 miles per hour, making it one of the fastest fish in the ocean!

A jellyfish no wider than a fingernail cannot die of old age. When Turritopsis dohrnii gets old, starving, or injured, its adult cells transform and it shrinks back into a polyp - the larval stage it grew from years earlier. Then it grows up all over again, and can repeat the loop indefinitely. That makes it biologically immortal. Scientists only noticed in the 1990s, when aging adults kept reverting in their tanks instead of dying.

An octopus is less an animal than a separate experiment in intelligence. It has 3 hearts, blue blood (copper-based, not iron), and around 500 million neurons - as many as a dog - but most of them sit in its 8 arms, which can taste, decide, and act on their own. Scientists treat it as the closest thing to alien biology on Earth, and it can even edit its own RNA. When it jet-swims, its main heart stops beating.