The "Bird Griffin" - Vogel Gryff - seems to be yet another of the dragons in Basel. It is one of the three signs of the three "Ehrengesellschaften" of Basel. I am not sure how to translate it. Maybe "honest societies"? They come from the old Zuenfte, where the workers of Basel were put together. That was some sort of a union to help the workers.
The three Ehrengesellschaften are:
Rebhaus, Greifen and Haeren. They are represented at the "Vogel Gryff" event through the "Wild Maa" (wild man), "Vogel Gryff" (the Bird Griffin), and the Leu (Lion).
The Vogel Gryff is a thing of the smaller Basel (Kleinbasel). The three representatives in their costumes are coming together, dancing in front of several buildings and going down the Rhine until the Middle Bridge on a raft.
The Gryff is not really a bird. It is that fabulous animal like seen in the newest Harry Potter, and it is often shown with four legs. A Griffin, like in Griffindor.
This "Vogel Gryff" festival is a tradition with many aspects. When they are dancing, three Uelis are collecting money. The Uelis that also belong to the three Ehrengesellschaften are white/green. There is a fourth one that is white/black since 1937. They were collecting money for the widows and orphans of the members of the unions (there wasn't always the social state like today). Today the money they get (also over shecks) is still used for social institutions in the smaller Basel.
Another interesting thing is the Wild Man (see tip there).
The bigger Basel didn't like this festival, so they made and hung up a face that is showing its tongue to the smaller Basel. The "Laellekoenig" (Tongue - king). You can find that face on the Middle Bridge looking at the side of the smaller Basel....
Start of this local event is around 10:30 (depends on the water in the Rhine);
in 2005 it was on January 13th.