park

Today when I went down to the park, it was cloudy and windy.
When I was walking towards the harbor, I could see the dust getting blown around in the wind.
When I was at the breakwater, I saw two kingfishers, some sea gulls,some mergansers and some ducks.
When I was in the park, I saw some sea gulls flying over the beach, and I saw a squirrel with a pine cone sitting on a branch alarming.
When I was at the battle site bench, it was low tide and I saw some sea gulls out by the water.
When I was on the trail near the trail by the river, I saw some sea gulls and ducks out in the water.
When I was on the trail by the river, I saw a swan on the other side of the river. I also saw what I think was a spine in the bushes. It was sort of orange colored.
When I was on my way back home, I saw some more sea gulls and I heard and saw some eagles.
Why was there only one swan?
What did the spine belong to?
How long had the spine been there?