park

Today when I was walking down to the park, it was cold and sunny. When I was on the breakwater, I saw some seagulls and ducks. When I was by sage beach, I saw lot of shorebirds on sage rock along with some seagulls. when I was at the battle site bench, it was high tide, and I saw some seagulls in the water, and I log by the shore in the water. When I was by the trail by the river, I saw some seagulls out in the water. When I was on the trail by the river, I saw some ducks on a log that was in some long yellow grass on the other side of the river. I also saw two male buffleheads and a female bufflehead in the middle of the river near where the ducks were. when I was on my way back home, I heard some kinglets and a chickadee. I also heard a red breasted sapsucker in the same trees and after I heard it I saw it too. I watched it for a bit, then I walked the rest of the way home.
Why was the sapsucker there?
Why were the sapsucker and the kinglets and the chickadees in the same trees?
Why were the shorebirds on sage rock?