Meaning: The sentence paints a picture of birds happily flying and singing in the vast sky, conveying a sense of freedom and joy.
Choice of Words: Birds - warm-blooded animals that have feathers and lay eggs. Chirped - made short, high-pitched sounds. Merrily - happily and cheerfully. Flew - moved through the air using wings. Across - from one side to the other. Vast - very large in size or extent. Sky - the space above the earth.