https://www.news4jax.com/news/mysterious-sea-creature-washes-ashore-in-st-simons-island
The variety of aquatic life is astounding.
https://www.ranker.com/list/weird-sea-creatures-washed-up-on-beaches/michaelgraff
There are plenty of aquatic species that remain unidentified or unknown.
http://www.independent.co.uk/news/world/asia/sea-creature-indonesia-giant-squid-whale-seram-island-mysterious-huge-dead-monster-a7732871.html
Just because something is ugly or even monstrous, that doesn't mean that its dangerous. Or does it?
https://www.washingtonpost.com/news/speaking-of-science/wp/2017/09/14/the-fanged-faceless-sea-creature-that-washed-ashore-during-harvey-has-been-identified/?utm_term=.3f0d25bd5f74
Some of these creatures will do more than gnaw on your leg or bite you in half. They can swallow you in one gulp! That's warm and fuzzy nature for you.
https://www.ranker.com/list/scary-fish-facts/ranker-science?ref=collections&l=2374563&collectionId=1339
Some life forms in the water or on land are just naturally dangerous.
https://www.ranker.com/list/horrifying-creatures-found-in-the-deep-sea/laura-allan?ref=collections&l=2374563&collectionId=1339
https://en.wikipedia.org/wiki/River_Monsters#Series_preview ,
https://www.youtube.com/channel/UComwL29zYKujb1JhkB0EcGA/featured ,
https://en.wikipedia.org/wiki/River_Monsters#Season_Nine_(2017) ,
https://www.animalplanet.com/tv-shows/river-monsters ,
https://www.youtube.com/channel/UComwL29zYKujb1JhkB0EcGA/videos
The rivers, lakes and oceans can provide a hint of the cosmic biodiversity that could exist on other worlds.
https://mvextra.blogspot.ca/2017/12/slimy-creatures-with-bug-eyes-and-razor.html