TIL that, Some species of pearlfish have chosen an interesting shelter: inside the anus of a sea cucumber.

https://www.australiangeographic.com.au/blogs/creatura-blog/2014/08/pearlfish-lives-in-sea-cucumber-anus/
#til #todayilearned
https://www.reddit.com/r/todayilearned/comments/1g3hxw1/til_that_some_species_of_pearlfish_have_chosen_an/