Answer: the simile in this excerpt compares the ugly words with buzzards.
Step-by-step explanation: A simile is a figure of speech in which two things that we usually not similar, are compared, with the function of create an image and help understand a point. In the given excerpt we can see the comparison between the words Mr. Shiftlet's has in his head, and a group of buzzards, and it creates the image of the ugly words posed in his head as the buzzards on the three.