Meaning: A bird that is feeling very happy and enthusiastic is making a pleasant series of sounds inside a tree.
Choice of Words: Excited: feeling very happy and enthusiastic; bird: a warm-blooded animal that has feathers and lays eggs; sings: makes musical sounds with its voice; sweet: having a pleasant taste or smell; song: a series of musical sounds sung by a bird; in: inside; tree: a large plant with a woody stem and branches.