Rock on =^.^= Charles Dodgeson to the max. Get a Deutch Dictionary to figure out the meanings of these words. We need a Jabberwocky in this game =^.^= "Flimsy falcon"
Correct me if im wrong but I have only gotten normal size bird feathers from these guys. The thing that drops the giant bird feather that is also in the Meph mountains is a Axe Beak which is a cockatrice type monster.
These mobs can easily be exp chained in Meriphataud around Level 15 - 17 in a small group (2 or 3 people). They mostly con tough around 15, and around 17 you will see a mix of decent, even and tough cons.
A great mob for great xp in the 11 - 15 level range. Make sure you have a good group. This thing wont rip your group a new one like those Wandering thingies.