They winter here. It is amazing. We saw them come back to the lake in waves. Seemingly endless clouds of them moving across the skyline. There were more types of ducks than I could possibly identify plus egrets, geese of several types and lots of other shore birds. The coolest was an American bittern. It is so wonderfully camouflaged it can hide in plain sight. There were great horned owls on the cliffs by camp. We heard them long before we saw them. Bitter Lake Wildlife Preserve and Bottomless Lake State park are both great in the fall for bird watchers.