Sorry your duck didn't survive.
(Kitty prolly got revenge fer all those birds that got away on the other side of the window!)
It seems like a regular piece of driftwood so it could be okay. You just may need to soak submerged for a time to get it water logged. Hard to know what tannin's may remain. Be on the lookout for any signs of growths or fungus as woods are a food source that have a tendency to develop these.
kinda turned a bit of a blind eye to naturals like this in favor of some of the decent real looking plastic and ceramics now available that won't leach or bleed unwanted elements into the water.