park

When I was at the park for the second time today, it was a bit cloudy.
when I was walking out on the breakwater, I saw a lot fish in the water in the harbor. I had seen them in the water earlier in the day too.I guessed that they were salmon fry.
When I was out at the end of the breakwater, I saw some sea gulls and ducks.
When I was walking back from the end of the breakwater, I saw some ducks and wigeons in the water and on the rocks by the science center. The wigeons flew off the rocks when they saw me walk by.
When I was at the beginning of the park trail I saw a lot of varied thrushes on the trail and in the woods and they all flew away farther into the forest when I walked by.
When I was nearing the battle site bench, I heard some kinglets in the forest, and I saw some sea gulls out on the beach.
When I was at the battle site bench, it was low tide.
When I was by the trail by the river, I saw seven swans farther out, along with some sea gulls. I also saw a kingfisher dive into the water then fly off.
Why were there so many Varied thrushes at the beginning of the trail?
Why did the kingfisher dive into the water?
Why were there so many small fish in the harbor?