mosasaurs were seagoing lizards think of a giant swimming whale sized Komodo dragon let's talk about the oceans of our world they're massive and deep and that means that we honestly don't know everything that exists within them in fact if you ask a scientist you'll find out that we've only mapped out about 5% of the oceans themselves fortunately despite not always knowing what's there there we've had plenty of interactions and encounters with the many many creatures that live in the Deep they range from small armored organisms that were snuffling around on the bottom feeding on detrius and things up to the large apex predators like dun colosas and while a lot of them have been cool or unique there are some that keep people's attention because of their sheer size it's not unfair to say that many of the biggest creatures that have ever existed have come from the depths of the sea or the ocean so with all of that in mind here now are the 20 largest sea creatures that ever existed
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