This question is based on Literary Appreciation 'You are the cold nests In which the migrant bird lays no eggs.' Kittobbe: To the Childless The device used ...
The device used in the excerpt is a metaphor. A metaphor is a figure of speech that implies a comparison between two things without using "like" or "as." In this case, the poet compares a person or a situation to a "cold nest," which suggests that the person or situation is unwelcoming and unsuitable for the purpose for which it was intended. The comparison implies that just as a cold nest is unsuitable for a migrant bird to lay its eggs, the person or situation is unsuitable for the intended purpose, which is to have children. Therefore, the metaphor conveys a complex idea and creates a vivid image in the reader's mind.