Final answer:
Hummingbirds choose 'not to' make a noise audible to humans, which relates to the specific sound frequencies they use for communication within their species. Bird calls serve distinct functions and play a role in survival and natural selection. Option 3
Step-by-step explanation:
In the context of aural communication among birds, hummingbirds make choices about the sounds they produce. These sounds play critical roles in various biological functions, such as mating, warning of predators, and establishing territory. The correct answer to the given question is 'Option 3: not to', meaning hummingbirds choose not to make a noise that people can hear.
This choice is likely influenced by the sound frequencies that are most effective for their intended audience, which may be other hummingbirds, and not necessarily audible to humans.
Birds make aural signals, such as calls, to communicate information within their species about the presence of predators or other important social cues. This behavior supports the claim that communication of information affects natural selection among small bird species. Biologists have found that different bird calls serve specific functions, indicating that their evolutionary fitness can be linked to their ability to effectively communicate. Option 3