#Wikipedia is great i donate to them as often as possible bc i like actually good information in this apocalyptic time where AI is rampant

[mammoth-clangen]

Do you have any source websites about mesozoic wildlife/ecosystems? I want to make a clangen or just comic thing about some form of dinosaur (either the microraptor, velociraptor, or kulindadromeus) and I'd like to figure out what other species were a part of their life

Nope sorry, research is rarely that easy buuuuut...

*cracks knuckles*

H'okay I have some advice but it'll probably be long and rambly.

Disclaimer:

I am a professional Nothing and am not an authority on anything. There is no right or wrong, this is just how I Personally do research.

Short answer:

Work out what geological formation(s) your chosen main-character-species is found in and Wikipedia it. (E.g. Kulindadromeus is fron the Russian Ukureyskaya Formation). Then go to Wikipedia's sources and skim at least the abstracts of scientific papers to get an idea if things.

If the Formation is lacking info, try searching the Epoch they're from. By that I mean "middle Jurassic" not just "Jurassic" 'cause each of these is already Huge, you want a decent idea of the overallworld they lived in! (Better yet, get it to stage, like Callovian or Maastrichian)

Also learn to draw ferns, lots of ferns, there's no grass in the Mesozoic so the groundcover is Weird cx

Long answer

(to be considered before even getting to the above step):

When choosing a setting for a story, particularly a paleo one, I find it useful to decide on what kind of story I want to tell first, then pick a species that compliments that.

A clangen, for example, relies heavily on the species being very social (such as herding hadrosaurs or sauropods). Telling a story about a lone traveller might be better with a large pterosaur or wandering ceratopsian. A story about warring factions would be better set a high competition environment like the Kem Kem or Morison, with several fighting predator guilds. Conversely a story about working through personal differences may be better with different species of herbivores living in symbiosis; hadrosaurs and ornithomimids acting like modern gazelles and zebras.

Etc etc

Choosing a species first is fine, but you'll likely have to work the story around what makes sense within that! Otherwise you end up with the aforementioned social tigers and patriarchal hyenas.

Also don't shrink-wrap your dinosaurs im begging on my hands and knees

tl;dr: research everything, choosing a species before a story is climbing ass-first up a tree, Wikipedia is your friend because they compile and summarise primary sources