How do you know that the Spring is coming?

When I went for a walk, I saw things which were different from January so basically things which were not in Winter. I went to the lake and saw the mice melted or at least half of the ice was melted. When I was coming back, I came from a forest and I saw flowers blooming. Some leaves were comming on some of the trees. I saw one pussy willow pajun kisa in Finnish. Yesterday I saw some birds humming. I think those birds don't come in winters and the snow melted a long time ago.