Meaning: This sentence means that the speaker was walking through a forest and the birds were singing happily.
Choice of Words: Birds are warm-blooded vertebrates characterized by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a lightweight skeleton. Chirped implies that the birds were making a high-pitched, short sound. Merrily implies that the birds were making the sound happily. Forest is a large area of land covered with trees.