What is the effect of red light on bats during observations?

Bats have a unique vision system adapted for their nocturnal lifestyle, and one of the characteristics of their vision is that they are less sensitive to longer wavelengths of light, including red light. This means that while humans perceive red light quite vividly, it is often outside of the visual spectrum for bats. As a result, using red light during observations does not disturb or disorient them, making it an effective tool for researchers and wildlife observers who want to monitor bat activities without negatively impacting the animals' behavior.

Utilizing red light is particularly advantageous in bat studies, as it allows researchers to conduct their work during the evening hours without disrupting the natural activities of bats, which are crucial for their foraging and social interactions in the dark. Other light forms, such as white light, can be disruptive and may lead bats to modify their behavior or avoid areas where bright lights are present.