park

Today when I went down to the park for the second time, the sun was setting and it was cold enough that I could see my breath. When I was out on the breakwater, I saw some seagulls, ducks and one eagle out on a post in the water that had some grass on it. When I was in the park, I saw some varied thrushes that flew away when I saw them, and I heard what I think were ravens making some strange nosies. When I was at the battle site bench, it was low tide and I saw some seagulls and black oystercatchers fly off when an eagle flew past. When I was by the trail by the river, I saw some ducks and wigeons out in the water, and I saw a seagull dive into the water from a rock. I also saw that the sunset turned the clouds and some of the snow on the mountains pink. When I was on the trail by the river, I saw three wigeons on the side of the river I was on, but then they flew to the other side of the river. When I was on my way back home, I saw a place that had some bushes and trees torn down by an old house and there was a pipe on top of a black tarp.
Why does the sunset turn the snow and clouds pink sometimes?
Why is the pipe being put in?
Why were only the three wigeons on the river?