The swallow

I saw the first swallow in the small woods yesterday.
They are said to travel for thousands kilometers from the south and stay during simmer and go back to the south in winter.
They give birth and raise their children in Japan during their stay.
Every summer the number of them is getting decreased.
I seldom see them recently.
So I felt very joyful seeing the view of the swallow flying in the sky,
I wish their hard works could promise their life prosperous. But the environment seems to be getting worse and worse for them.
I found the site of observing the wild life 'swallows' .
It tells us in danger of wild life will warn our life, too.