As the title says.
Are they reptile, bird, or amphibian? (not sure if 'bird' is a genus) Oviparous for sure.
Endo or Exo-thermic?
IMTU, the Droyne are setting up a colony/settlement five parsecs away from the Scout base of operations. Contact was initiated by the Droyne themselves.
I believe you're misconstruing class for genus. In addition to the errors already pointed out.
They would be in a parallel to the vertebrata class, and an order, family, and genus within it... but unless serious panspermia, they're not even in one of the 4 current taxonimic kingdoms.
If forcing them into the terran system and ignoring the genetics, they're closest to either Aves (birds) or Reptillia, but the first geneticist runs the numbers, and puts them probably in at least a new Phylum, if not Kingdom, and goes to town on xeno-microbiota from a fecal...
They are partially scaled, leather skinned, warm blooded, egg laying, compound eyed (no Terran vertebrate is), 3 gendered, hexapoid-descended, flying omnivore gatherers with farming and massive psi. That they're considered playable is proof Marc's idea of playable is broad. (AM K'Kree Proves that Marc's idea of playable is well past my own.)
Much the same goes for Hivers, Ithklur, Viurushi, Ael Yael, Bwaps, Vegans, Aslan, Eiboken, Hlassani, Dandies/LLewelloly, Danin (decanonized - JG)...
It may even apply to the Darrians... I've not seen the official take on that. But Darrian culture includes multiple species, as does Aslan culture.
The few I can recall that can be fit nicely include Vilani, Vargr, Solomani, Zhodani, Sword Worlder, Ardenese, Uplifts (Chimp, Orangutan, Banobo, dolphins, orcas), severe genemods (including Lurani and Jonkerer), dozens of other human minors... because theyre descended from terran animals. Everyone else is in another kingdom.
en.wikipedia.org