Final answer:
Birds react to environmental stimuli using chemical, aural, and visual signals to communicate warnings about predators, which are essential behaviors for their survival and can influence natural selection.
Step-by-step explanation:
Birds communicate and react to their environment through various stimuli, which are essential for their survival and interaction with other birds. Here are three examples of stimuli that a bird reacts to:
- Chemical signals: Birds release chemical compounds into the air that are rapidly recognized by other birds as signals of the presence of a predator.
- Aural signals: Birds make vocalizations such as calls that serve as warnings to other birds when a predator has been spotted in the area.
- Visual signals: Birds exhibit visual signals like wing flapping to communicate warnings to other birds about nearby predators.
These signals can be a combination of instinctual or learned behaviors and play a crucial role in their survival by affecting natural selection.