Millions of years ago, while dinosaurs ruled the land, ferocious reptiles over 20 metres long hunted and ruled the sea.

Sea Monsters: Prehistoric Ocean Predators exhibition opens at WA Maritime Museum tomorrow, Saturday 1 April, and is set to scare and amaze visitors with its life-sized casts from real specimens and fossils never-before-seen in WA.

Sea Monsters features more than 70 exhibits and tells the fascinating story of these once land-dwelling creatures that adapted to the sea.

The exhibition is an opportunity to view Earth's prehistoric heritage and see how today’s top marine predators compare.

Visitors will come face-to-face with life-sized casts from real specimens, including a 13-metre long Elasmosaurus and a nine-metre Prognathodon, a 1.4-metre Kronosaurus jaw, and a five-metre long fish that died after swallowing another fish whole.

"This exciting exhibition combines the latest scientific thinking with wonderful specimens and cutting-edge multimedia to re-create these extraordinary creatures and the prehistoric world in which they lived.  It is seriously not to be missed," WA Museum CEO Alec Coles said.

Developed by Australian National Maritime Museum in partnership with Queensland Museum, the exhibition was first displayed in September 2019 at Australian National Maritime Museum. It has also been exhibited at Museum of Tropical Queensland, Queensland Museum, and Auckland Museum.

Sea Monsters is a family-friendly exhibition held at WA Maritime Museum from 1 April to 16 July 2023.

Tickets are available at https://bit.ly/SeaMonstersWAMM