For Aurleon Mutation slot 1, There are only 2 mutations called Finned Crest and Peacock Crest.
But then in Mutation slot 2 there are a lot of other mutations, but the last 2 are Petal Crest and Quail Crest...???
I can understand Petal Crest since it affects more than the head but Surely Quail Crest should be in M1 Slot??
thanks for reading heres a pretty bird~

They're put in that order based on what was released first.

But for Quail Crest, it seems like it's a mutation that covers the front of the head (in front of the default head plume).
Mutation 1 (Finned and Peacock Crest) are more of crests behind the head. Because they're behind the head, it doesn't conflict with most of the Mutation 2s, which are on the front of the head.

Quail Crest + Finned Crest
Ornate Helm + Finned Crest
Petal Crest + Finned Crest
Shimmering Jewels + Peacock Crest

Most of the quail head feathers seem to jolt outwards, but still are on the anterior of the head. So imo it makes sense that it's in Mutation 2, which covers front-head mutations.

The only way it would easily fit Mutation 1 (being behind the head) is if it was redrawn to sprout from all the way behind the head. ;w;

Edit: I still support the addition of other mutations to fill up Mutation 1's slot, but Quail Feather seems to be okay for now as far as it being positioned in front of the head. o:

Flute's reasoning is why we put Quail crest in M2. :)