Yasmin Tirado-Chiodini said this quote

And then there was nature’s music. The small frog the locals called coquí was a treasured new sound, a lullaby sung by the chanting Puerto Rican native species. Sometimes, while he lay in bed awake at night, Manuel tried to imitate the sound of the little frog. He tried to sing it at first. But then he realized he could get the sound just right by whistling it. “Coquí! Coquí!” Manuel whistled. He improved his coquí whistle every day, until he sounded just as the little frog. People in town laughed at Manuel practicing his coquí sounds. Sometimes they could hear his whistles from outside the store, as though Manuel was carrying out a conversation with the small creatures.The tiny coquí sang through the nights and soothed Manuel’s sleep, keeping him company and reminding him that he was not alone.