Incubators are often kept at a temperature of around 37 degrees Celsius (98.6 degrees Fahrenheit) because this is the temperature that is optimal for the development of many types of eggs, including chicken eggs. This temperature is close to the body temperature of the parent bird, and it is believed to be the temperature that provides the best environment for the embryo to grow and develop. Maintaining a stable and consistent temperature inside the incubator is important for the proper development of the eggs being incubated. If the temperature fluctuates too much or is too high or too low, it can disrupt the development of the embryo and may result in abnormal or unsuccessful hatching. It's worth noting that the optimal temperature for incubating eggs may vary depending on the species of the eggs being incubated. For example, some species of reptiles and birds may require slightly higher or lower temperatures than chicken eggs. Incubator operators should carefully research the specific temperature requirements of the eggs they are incubating to ensure that the incubator is set to the appropriate temperature.