Alliteration
a figure of speech in which the same sound appears at the beginning of two or more words. Alliterative words are consecutive or close to each other in the text.
Example From Text
They were singing a sad song….
Explanation
The repetition of the "S" sound in "singing a sad song" emphasizes the Humans' sorrow. They have lost many loved ones, and they do not know if they will survive the bitter cold.