Hey guys, trying to contribute again
I noticed that there wasn't a thread about this after searching a bit, so here goes.
These guys fly around in packs with 5k hp each in deepholm. Just go to the spot and aoe them down.
Alternatively, you can attack one and the rest will aggro on you.
Hope you'll get your trophies fast, at least i did. Also did this with the charms during love is in the air.