Why did sea monsters have long necks?

From the journal Science: A recently found fossil represents a new species of ancient marine reptile, and researchers think its long neck may have helped it hunt prey stealthily.
This is additional taxonomy that helps us with analytics

How did plesiosaurs swim with such long necks?

Researchers Discover Prehistoric Sea Monster with Snake-Like Neck and Crocodile-Like Jaw; Name It 'Snaky Crocface

Ancient reptile with 'ridiculously long neck' unearthed in Alaska

Sea Monsters of the Cretaceous - Owlcation

Facts and Figures About Plesiosaurus, the Long-Necked Marine Reptile

Plesiosaurs and Pliosaurs - The Sea Serpents

Sea monsters really DO exist, scientists claim

Premium Photo A sea monster emerging from the water its long neck and head stretching upwards

In the 1600's there was a report from Britain of a seal skin with an unusually long neck. This matches the theory that long neck seals are responsible for some sea serpent

Size of a Jurassic sea giant found due to fossil discovery, study says

Long-necked Sea Serpent

Why did sea monsters have long necks?

Analyze This: Bulky plesiosaurs may not have been bad swimmers after all

A Sea Monster Emerging From The Depths, Its Scaly Head And Long Neck Visible, Created With Generative Ai Stock Photo, Picture and Royalty Free Image. Image 206631249.