Answer:
I am a busy worker who is a water mammal.
I give people a huge fright but at the end I'm sweet. I normally celebrate at night when there's less heat.
The more you have of it the less you see. What is it?
What is it that makes tears without sorrow. And takes its journey to heaven?
They come out at night without being called. They are lost in the day without being stolen. What are they?
What never gets any wetter no matter how hard it rains?