Dinos of the Deep

Dive into prehistoric seas

Journey through the Western Interior Seaway, where massive mosasaurs, sharks, and savage marine reptiles dominated the age of the dinosaurs — beneath the waves. This exhibit features 36 specimen, including huge carnivorous marine reptiles, flying reptiles with the wingspan of a small airplane, gigantic flesh-eating fish big enough to swallow an adult human, and the biggest sea turtles to have ever lived.

Open now through September 10, 2023

Three kids look up at a case containing dozens of Lego minifigures

Enhance your experience

Help your learners get the most out of your visit.


massive fossil specimen

kiosks and graphic panels

touchscreens and big-screen videos

mobile device content

real fossils for visitors to touch

Did you know?

If it flew in the air or lived entirely underwater, it’s technically not a dinosaur. Our pteranodons and mosasaurs, for example, are massive reptiles — but they lack the specific bone structure needed to be classified as part of the clade Dinosauria. The Cretaceous era was full of all sorts of fascinating creatures!

One visit not enough?

Visit as often as you like with an MOI membership.

This exhibit is produced by Triebold Paleontology.