Park

Today when I went down to the park for the second time, it was still raining.
When I was out on the breakwater, I saw some sea gulls, ducks and harlequins. I also saw a great blue heron on the same pole it’s been on the last times I’ve seen it.
When I was on the trail by sage beach, I saw some ducks on the steps leading down to the beach.
When I was nearing the park, I saw a kinglet and heard some chickadees. I also saw a squirrel eating a pine cone.
When I was in the park, I saw some mergansers out in the water.
When I was nearing the battle site bench, I saw some buffleheads, goldeneyes and harlequins out in the water.
When I was at the battle site bench, it was high tide and I saw a few sea gulls.
When I was on the trail by the river, I saw a lot of mergansers and some geese, ducks, buffleheads and goldeneyes.
When I was on my way back home, I saw three eagles flying around the harbor and some ravens.
Why were there so many mergansers?
Why were the ducks on the steps?
Why do the herons always seem to be on the same pole?