park

Today when I went down to the park, it was cloudy, cold and the ground was wet. When I was nearing the end of the breakwater, I saw a song sparrow by the harbor. When I was on the breakwater, I saw some seagulls, ducks and a eagle out on one of the poles out in the water. When I was in the park, I saw some four ducks in the water near the shore. When I was nearing the battle site bench, I saw some ducks out in the water, and I saw two shorebirds flying. When I was at the battle site bench, it was low tide, and I saw some seagulls and crows out by the water. When I was on the trail by the river, I saw some ducks farther down on the other side of the river. When I nearing the foot bridge, I saw a eagle fly off out of the trees. When I was on my way back home, it was getting darker, and I saw some more sea gulls, and some goldeneyes across the road on sage beach.
Why were the ducks farther down the river?
Why were there ducks at the beginning of the park?
Why were there only two shorebirds flying?