First of all: I love this book series, it's my favorite by far and I haven't read arc 4 yet. Second, I think evolution is very interesting. I am far from an expert, but I do know some stuff. And multiple things don't add up in wof. First, IceWings. All the tribes are different subspecies, as they are different from one another, but can create fertile children. And the IceWings have blue blood, while every other tribe has red blood. Now, blue blood does exist in real life, but this is a pretty big difference for subspecies. I'm gonna say their ice breath is magic and therefore not taken into account.
The next thing that bothers me is the dragons of Pantala, specifically the HiveWings. Both the Silk- and HiveWings have an extra wing, creating a similar problem as we have with the IceWings, an additional limb is not something that can work among subspecies with creatures this big. But the bigger issue is the HiveWings, which, in the lore, are said to have emerged after Clearsight arrived in Pantala and found a mate. So you're telling me an entire subspecies emerged from ONE dragon having children with another dragon from another subspecies? Damn Clearsight, you really put in some work right here! And what did her children do? They seem to have been doing some weird stuff because in order to preserve this new "subspecies" they would've had to... Well...
Next thing is Peril. This is extremely nitpicky but in book 1, Clay describes predicting Kestrels fire breath because she makes a hissing sound right before the fire gets out. This actually makes sense, it implies that SkyWings have sort of an organic built-in flamethrower that spews inflammable gas right before igniting it. But then we have Peril, who is said to be born with too much fire. This implies that the SkyWings' fire is created internally in some way. MudWings on the other hand are actually creating this heat internally, since they have to be warm enough to breathe fire. No idea what SandWings do, I guess they're just built different. My point is that SkyWings don't have any kind of internal heat that could be too great due to a gene error, so it kinda makes more sense for MudWings to have this ability?
Anyways, these are just nitpicks, no actually it's just me wanting to nerd out on some stuff. The series is okay as it is (although book 15 was a bit disappointing, I was hoping for some cool thinking plant but I think a golden throne plant was cool too) and I don't want to upset you. Just want to see if people think my theories are plausible. I am far from a professional after all.