Final answer:
Descriptions of a loon's calls in literature can convey the bird's wildness, contributing to the setting's atmosphere, whereas in biology, various bird calls serve as crucial communication methods that impact natural selection.
Step-by-step explanation:
The author's descriptions of the sounds made by the loon evoke a sense of the bird's wildness in the natural environment. These sounds are aural signals that convey different types of information, such as the presence of a predator, reflecting the bird's behaviors and adaptations for survival. For example, in literature, a loon's haunting call might contribute to an eerie atmosphere or highlight the isolation of a setting. Conversely, biologists have found that different calls by small bird species serve as communication mechanisms, which are crucial for their survival and have implications for natural selection. Such sounds play a significant role in the behaviors of birds, whether in a literary context or in the study of behavioral ecology.