park

Today when I went down to the park it was cloudy and a little bit windy. When I was on the breakwater, I saw some seagulls, goldeneyes, ducks, and crows. When I was near the park, I saw that the bucket on the bench was gone. When I was in the park, I heard some ravens in the trees all the way up to the battle site bench. When I was at the battle site bench, I saw a bunch of goldeneyes and a old small boat with out a moter by the shore. When I was nearing the trail by the river, I saw some small silver metal strips on the base of some of the trees and when I looked they had numbers on them. When I was on the tail by the river, I saw some buffleheads, seagulls, and ducks. When I was by the foot bridge, I saw a squirrel on a tree. When I was by sage beach on my way back home, I saw what I saw earlier, and an eagle and some shorebirds.
Why were those silver things on the base of some of the trees?
Why did those silver things have numbers on them?
Why were there buffleheads at the park today?