In literary terms, what does "eager as a beaver" exemplify?

The phrase "eager as a beaver" exemplifies a simile because it directly compares the eagerness of one thing to that of a beaver using the word "as." This literary device helps to create vivid imagery and a clear understanding of the level of eagerness being described. Similes often utilize such comparisons to enhance the descriptive quality of language, making it more relatable or poignant for the reader. In this case, beavers are known for their industrious and hardworking nature, which reinforces the sense of eagerness being conveyed in the expression.