The Gigantic Octopus...

https://en.wikipedia.org/wiki/Gigantic_octopus ,
https://www.youtube.com/watch?v=Yp3QUJcagxM
Who really knows how big some of these things have gotten?

https://en.wikipedia.org/wiki/Enteroctopus#Distribution
The larger the predator, the more things that can become its food.

https://www.youtube.com/watch?v=SXgKb8GUjoM
It might not be paranormal, but its quite a very skilled creature.
https://www.youtube.com/watch?v=Ar5WJrQik2o

http://www.dailymail.co.uk/news/article-2968785/Is-octopussy-Cat-gets-octopus-clamped-face-trying-snatch-paddling-pool-eat-it.html

http://www.strangeanimals.info/2014/03/promachoteuthis-sulcus.html

http://www.businessinsider.com/comparison-of-the-biggest-animals-in-ocean-2015-1
A man becomes a mouse when compared to some of these beasts.

http://www.diffen.com/difference/Octopus_vs_Squid

https://curiosity.com/playlists/the-elusive-giant-squid-U5rTt9yN/#intro-playlist

Nature is full of monsters that are only too happy to rip you apart.
https://monsterminions.wordpress.com/tag/cryptid-list