Final answer:
The literary device used in the given sentence is personification, which gives human qualities to non-human subjects, such as birds referred to as 'workmen' with a trade. This use of figurative language can enhance the reader's understanding and enjoyment of the text, bringing it to life and suggesting deeper themes.
Step-by-step explanation:
The literary device used in the sentence "These feathered workmen don't train under anyone; their trade comes to them by nature; and how well they work at it!" is likely personification. This device attributes human qualities to non-human entities—in this case, referring to birds as 'workmen' who possess a 'trade' implies that they have jobs and skills as humans do. It's important to recognize this usage as it brings the text to life, providing mental images that can make the concepts being discussed more relatable and vivid for the reader.
Understanding these patterns of language like figurative language and rhetorical devices can enhance the reader's grasp of the text. Identifying such devices often brings a deeper appreciation for the author's craft and helps unearth layers of meaning that may not be immediately apparent. The use of personification can not only create a memorable image but can also suggest underlying themes or messages that the author wishes to convey about nature and instinct.