Robert Frost has highlighted the reality of human life in this poem like his other poems. In this poem, the poet discusses the inevitable death. All the other animals on the earth, including humans, will one day taste death. As we are born already, death is certain. Animals are slowly decaying, and thus will one day become extinct. Here, through Oven Bird's song, the poet is reminding death is the hard reality of this life. Oven Bird lives in the forest. It sings on a leafy summer day and on a sunny autumn day. But its music does not make people happy. People listen to its songs and get soaked in pain. Because the songs remind people of death. And thinking about this inevitable death, people sink into depression.