Together with Lithoids, this is one of the best species packs of the game. It doesn't add mechanical changes bound to the species like Lithoids do, but it adds two civics, a bad one and a good one. Like Lithoids it adds actual mechanics to the game in the form of species traits, where you can add traits like phototropy where you can feed your species with energy instead of food, or the budding trait that adds a small percentage of pop growth in the form of assexual reproduction. The only bad thing about these trairs is that they're only bonuses to the actual gameplay, not an Overhaul or an new way to play them, that's why this species pack isn't a 5 star rating.