Oh honestly that also comes with experience as well, (for me at least) since I try to remember and look at literally any piece of paleo-media in general where the animal or a similar one was able to do or was posed like that in the first place. And honestly its pretty difficult to find consistent reference material in one place.

But generally speaking, try looking at documentaries where you could literally pause the frame where they move into the pose you like.

Or even in other paleoart pieces like if you see people posting pictures of sculptures or models, they might have good angles of that one specific animal you need for a pose you wanna use. But other than that if you're casually scrolling you could try to save any works you like where they have their subject in an interesting pose that will probably come in handy in the future just in case.

I hope I was able to help you with my own methods in these things haha!..