Put the verbs into the present continuous:

Listen to the birds. They (sing) .Look at that one. It (fly) high in the sky.The other one (play) with a worm.I feel happy because I (have) a good time here in these woods.

Listen to the birds. They are singing. Look at that one. It is flying high in the sky.The other one is playing with a worm.I feel happy because I am having a good time here in these woods.