Meaning: The birds were singing happily in the light of the early morning.
Choice of Words: The word "chirped" describes the sound that birds make. "Merrily" means happily or cheerfully. "Morning light" refers to the light of the early morning.
Alternative Expressions
The birds sang sweetly as the sun rose.
Meaning: This sentence is similar to the first one, but it uses different words to describe the birds' singing and the time of day.
Choice of Words:Sang is another verb that describes the sound made by birds, but it's a more general term than chirped. Sweetly means to make a pleasing sound, like a beautiful melody. As the sun rose sets the time of the action, when the sun is just starting to appear in the sky.
At dawn, the birds greeted the new day with cheerful melodies.
Meaning: This sentence is a bit more poetic than the first two, and it describes the birds' singing as a way of welcoming the new day. It's like they're saying, Good morning, world!
Choice of Words:Dawn is the very first light of day, just before sunrise. Greeted means to welcome or say hello to someone. Melodies are pleasant and harmonious sounds, like the songs of birds.