Hints:

How come my basket is empty
and yours is half full?
Because you're eating the berries as fast as you picked them, Little Bear.
Yes, but they're very good.
Hmm. Look! More huckleberries!
I found an egg!
Yes you did.It's a beautiful egg, Little Bear.
I wonder where it came from.
I can't see any nests.
What should we do?
We can't just leave it here.
I know, my basket can be a nest.
A little moss will make it nice and soft.
But the egg needs its mother to sit on it and keep it warm.
You're right. We have to find the bird who lost it.