Massive...isopod found lurking in the Indian Ocean

 https://bigthink.com/surprising-science/darth-vader-isopod?rebelltitem=4#rebelltitem4 

It's not really a monster. However, it could still be perceived as one of the many monstrous aquatic creatures. 

https://weirdnwildcreatures.fandom.com/wiki/Giant_Isopod

https://weirdnwildcreatures.fandom.com/wiki/Monsters_of_the_Deep 

https://en.wikipedia.org/wiki/Giant_isopod

https://upload.wikimedia.org/Giant_isopod.jpg 

If it touched you, it just might cause you to jump. 

It looks a little more like the Predator creature than DV. https://monsterlegacy.net/2017/06/12/predator

https://upload.wikimedia.org/The_Predator.jpg

https://en.wikipedia.org/wiki/Predator_(film)#Visual_effects , https://www.youtube.com/watch?v=m0TR6Id1yO0

The Making Of Predator https://www.youtube.com/watch?v=PgF4mXX67yo

PREDATOR - Behind-the-Scenes with Predator FX Crew https://www.youtube.com/watch?v=pEjehvMlu5k

Stan Winston's Predator FX Team at Monsterpalooza - Spring 2012 https://www.youtube.com/watch?v=L8SQUWr1w6g

10 Disturbing Yet Elegant Stan Winston Creatures Explained In Detail https://www.youtube.com/watch?v=kdQ2PxHWrLs

14 Gnarly And Deadliest Aliens In Sci-Fi Movies - Explained In Detail https://www.youtube.com/watch?v=xoxj9sNSBOs

Isopod & Fried Rice from Master Sushi Chef Hiroyuki Terada https://www.youtube.com/watch?v=54m4SDJiL6U , https://www.youtube.com/c/HiroyukiTeradaDiariesofaMasterSushiChef/videos

There is a wide variety of foods that people can eat on earth. Of course there are also plenty of creatures that eat people. 

https://thedigitallabyrinth.blogspot.com/search?q=monsters