There are no records of the Beastmen living in Dragon Pass in the First Age. During the later Second Age, there was the famous stitched zoo at Voss Varainu, where the Wyrms Minds Collective kept prisoners and slaves as zoo specimens, pets, laboratory freaks, and demi beasts. It is known that these were the results of blasphemous experiments to create new types of beings. However, the reasons for these experiments are unknown (although there is plenty of conjecture, most of which is wrong) and the Beastmen themselves claim they have always lived here.
The satyrs are one of the Beastmen types. Mostly male with a minority of females, they are sometimes confused for broo by ignorant humans. Famed for their lechery, satyrs consider dryads and other nymphs to be their natural mates, but will also try to court humans and elves. They do not force themselves on the unwilling. Like many other Beastmen, satyrs rarely join cults, but worship Arachne Solara at the Wild Temple. They are talented magicians with their woodwind pipes, and it is believed by some scholars that their skill is innate.
One thing worth emphasising is that there are plenty of mysteries about the Beastmen (including the ducks) that do not have answers. Not even by them.
So where do the ducks come from? Nobody knows for sure, not even the ducks (claims of Ganderland aside, which I suspect is considered dubious even by the ducks).