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Most of the world’s oxygen is made in the ocean by plants and other living things. But one species of phytoplankton (a plant-like bacteria) called prochlorococcus makes so much oxygen that it’s responsible for the equivalent of one in every five breaths we take. It’s tiny – 100 laid end to end are the width of a single human hair – but it is one the most numerous life forms on Earth. It’s estimated there are up to 3 octillion world wide. That’s 3 followed by 27 zeros!

Fish have been know to play pranks on each other. Scientists believe they do this for entertainment just like humans. One species of fish was observed pranking eachother by replacing sand into a freshly dig hole and moving discarded shells to look like a predator waiting to attack.

These facts are unbelievable!

There's plenty more to be found inside 100 things to know about Oceans!

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