Not sure if this was mentioned yet but since it isn't fixed I'll mention it anyway.
In the description of Vetus hatchling there is this sentence:
They do often do so to form shelters, or walk across water.
Saying "do" twice here doesn't sound right. Either say "They often do so to form shelters" or "They do so often to form shelters" but how it is doesn't roll off the tongue.
Another description error is here under the Voro manticore hatchling:
They practice learning how to stalk silently, and pounce on anything moves.
You are missing a "that" in there. It should be "and pounce on anything that moves."
Further more for Voro manticore hatchling:
Their jaws seem to grow impossible wide for a split second,
Should be "Their jaws seems to grow impossibly wide for a split second,"
Here is one on Arkenian Tantivus hatchling:
If not out of reach, a tantivus hatchling will will happily munch on a torch or even a lantern.
This just needs one less will in it.