I had noticed one flying while in that tower with the dead redguards and i was like "WTF!?" it was also made worse by serana's damn VL bug that made trying to kill it ANNOYING! >.<
They are weaker than normal chaurus but deal more damage for people who have yet to encounter one.
You sure? I found them more difficult to kill, and they did more damage. The hunter fledglings may be weaker than chaurus reapers, but the non fledglings murdered me.