Dark park

Today when I went down to the park the second time, it was raining hard but luckly I had my rain gear. They worked! It was also mostly dark. When I was out on the breakwater, I did not see anything. When I was by the science center, two ducks startled me as they flew up out of the water. When I was in the park, it was a little hard to see, but I could see the trail because of the little bit of light coming though the trees. When I was at the battle site bench, I sat down on the bench for a bit. While I was sitting, I saw some birds fly by and some in the water. When I was on the trail by the river, I saw a lot of ducks on the other side of the river, I was not sure if there were any other birds on the other side of the river because it was dark. While I was still on the trail by the river, I saw a lot of moths flying around the trail, I caught one but it got away. When I was on my way back home it had stopped raining.
Why is it getting darker earlier?
Why were those moths flying around the trail?
Why didn’t I see any seagulls?