Was it this old bird? http://www.uorenaissance.com/info/Gamayun She's a boss harpy, spawns on Covetuous level 2 in the "harpy room" on occassion.
hey soulkeeper sign up for the new player raffle. your passphrase is "dirty bird". http://uorforum.com/threads/project-sanctuary-new-player-raffle-drawing-saturday-march-14th.9346/
Soulkeeper, that was a boss. Bosses spawn, in certain areas, after a [fluxating] number if minions mobs are killed. There are a number of bosses in the world, each more devious than the last. In my experience, Gamayun is the one that spawns the most. I got her to spawn 3 times in about 40 mins once. Anyway, if you come across a named monster [boss] you can ask people in IRC for help, if you are so inclined. But join a channel and do that, or else reds will just show up.
Ive been very fortunate. Havent seen many red yet...and none have worried enough to pk me. unlike some other shards that shall not be named...