For your consideration · 5:18pm Oct 5th, 2022
Use "cavalum," a creature of Portuguese myth, to refer to batponies.
The concept of "thestral," near as I can tell, is one wholly made up by J.K. Rowling, and we have no need for any of that nonsense.
This notion was brought to my attention by Type Writer, which prompted me to do some research of my own and I found some compelling evidence.
I'm aware that expecting bronies to break from tradition is a huge ask but even if it weren't for certain people being hack authors of bland YA novels I'd still rather use a term derived from actual mythology than something that was made up for a prolific entertainment property.
Oh hey! I should also mention, I wasn't the first one to come to this realization; in fact, I got it from this post here, which doesn't seem to have spread very far otherwise.
Downside is that "thestral" is quick to say, not difficult to spell, or pronounce regardless of accent. Hrm...