park

Today when I was going down to the park, it was sunny and cold, and there was some frost on the ground.
when I was nearing the end of the breakwater, I saw those fish in the water that I had seen before.
When I was at the end of the breakwater, I saw some ducks and a sea gull. I also saw a great blue heron that was on the post I had seen the other great blue herons standing on.
When I was nearing the battle site bench, I saw squirrel eating a pine cone on a tree branch.
When I was at the battle site bench, it was low tide, and I saw some sea gulls, crows and ravens out by the water.
When I was on on the trail by the trail by the river, I saw some crows out on the beach.
When I was on the trail by the river, I saw some ducks.
When I was near the end of the park trail, I saw a squirrel alarming in the trees. I also saw a raven on a branch near the trail.
Why was the squirrel alarming?
Is that great blue heron the same one or a different one?
Why do the crows go out on the beach?