Do we have any idea what breed they were? Was there just none born? Did the moons still go through phases, just without being seen?

Between the comment that the it was a eugenics experiment conducted by the Thalmor and how badly they supposedly freaked out, I like to think they were all either stillborn or some other ungodly freak of nature. So hairless, in other words.

But nope, there's no information on what exactly happened during that time period for now.

Khajiit wild hunt. That's my theory what happend.