Conservation: This pack imo gets the biggest glow up when judged completly on its own. The leopard would loose most of its criticisms, the gibbon would be part of the little bit extra sea needs and with only 3 packs deserts get quite shafted (in my version) as their arnt many in the base game, so getting 2 desert ungulates is a blessing. In addition, the building set is just really good and diverse, with especally the tools and flowers adding a new dimension to the game.
Wetlands: This pack + conversation are really all asia needs to shine. We got the missing monkey, ungulate, and small animal species aswell as a bird, making asia pretty much allround complete. In addition to that, we get 2 now much needed south american animals, an otter and again a bird, so quite the catch. The lechwe and platypus are nice, but dont carry the pack like the rest do, as antelopes arnt a high priority and the platypus cant fill out australia alone with the salty.
Grasslands: Lastly to round things out, we got the grassland pack to enable australian areas with the emu and the wallaby. While the other animals arnt mind boogling, 2 more south american animals do help and some mid size carnivores for asia and africa do aswell, but the real reason its here are the butterflys. Walkthrough exhibits might not be my favorite thing, but they defenetly add something different and it be a shame to have not atleast one of them, and the butterflies truly are the most diverse version of them.