Edit: Oops should've looked at the Title of the Thread again. But I won't change my List now
A Animal that is similar looking to a Grasshopper and really beautiful in my Opinion is Tettigonia viridissima. It's really big (at least for a European Insect) but I don't really know if it is big enough for the Exhibits in the Game.
I would absolutely love it to see the Honduran White Bat (if they are somewhere kept in Captivity, which sadly seems unlikely). This Bat would fit perfectly even in the only Exhibit Size we're currently having in the Game. If it isn't kept in Captivity, I would be happy with another kind of Bat. But a looped Flying Animation if we get Bats as Exhibit-Animals is needed.
Even though Spiders aren't one of my favorite Animals, some kind of Peacock Spider would be really awesome.
We do also really need more Lizards and Amphibians. Chameleons would be great.
Please Frontier, give us a Cobra in the Cobra Engine
I don't know if the Exhibit Size would be suitable for the Animal in Real Life but I would love a Electric Eel in the Game.
Hierodula membranacea would be a great Species of Praying Mantis due to the big Size.
Some kind of Hummingbird would be awesome (with a Animation where they fly between multiple Flowers and drink from them. I think this Bird would be awesome as a Exhibit Animal)
I think I could come up with way more great Exhibit Animals but I'll stop now or else this Post will be 10 Pages long