Page Carousel

Hello,
I am working on a Website
about Diving on the Canary islands and have a list of fishes you can see.
All species have their own page and when you scroll to the end I want a carousel of similar species.
All species are in a certain group. Now I want all similar species to show up in the carousel without adding every single species on every single fishpage cause it is a lot of work.

For example: You’re on a page of a certain eel and in the carousel I want to show all eel and moray eels cause together they form the next bigger group and they also have a page together on my website.

Maybe you can help me. I’ve seen carousels that work with posts and you can show all posts of a certain category but i work with pages…

Thanks already. looking forward to your replies.
Ronny