A what in a what?

Some of the kids really like to sing while they are working on other projects. The other day, this is what I heard:

Student 1(singing): "On the first day of Christmas, my true love gave to me, a pinecone in a peach tree."
Student 2: "Hey, I thought it was a parrot in a pear tree."

Personally I think it should be a parrot in a peach tree.