The sentence you wrote, "The peacock's feathers are pretty, but its song is scratchy." is grammatically correct! Let's look at why:
- Subject and Verb Agreement: "The peacock's feathers" is a plural subject (feathers), so "are" is the correct verb.
- Possessive Form: "peacock's" shows that the feathers belong to the peacock, which is correct.
- Contrast with 'but': Using "but" to show difference between the pretty feathers and scratchy song is perfect.
- Pronoun Agreement: "its" correctly refers back to "the peacock."
So your sentence is clear and well written. Keep up the great work!