(I did test a little bit but very few dinos have this pen as a requirement)
or you need to place them in a bigger pen. It is possible to house dinos from different groups together but you probably need to spend a lot of time adding and removing Forest etc. This is not very precise but rather that these dinos share similar needs and you should be able to fit them in the same pen without too much trouble.
This means that while I put the dinos in the smallest pen I could use, it is possible to fit dinos in smaller pens but it makes it much harder to quantify how small a pen should be. I use one length of fence (drag a piece of fence as far as it will go) as my standard unit.Below I explain what I mean by standard size. I tried to make the smallest standard size pen possible for each dino.