Final answer:
The myth regarding the number of eggs to put under a setting hen pertains to stabilizing selection, which suggests that a moderate clutch size results in the healthiest chicks. Robins laying four eggs serve as an example, where more eggs lead to malnutrition and fewer may yield no survivors, illustrating the principle that may guide optimal egg number for hens.
Step-by-step explanation:
The myth about the number of eggs to put under a setting hen relates to the concept of stabilizing selection, where an intermediate number of eggs in a clutch yields the most viable offspring. Robins, for example, typically lay four eggs. If they lay more, it may lead to malnourished chicks due to limited resources; if fewer, it may result in no offspring due to the high investment required for each chick and the potential for some not to survive. This concept is applicable to chickens, which is often the context when discussing 'setting hens'. To ensure the best chances of survival and health for the chicks, a balanced number of eggs should be placed under a brooding hen that she can adequately cover and incubate without overcrowding or neglect.
Birds produce eggs with diverse characteristics, like camouflaged eggs for open nests or eggs that do not require constant moisture. Chickens and ducks, for example, have hatchlings that can fend for themselves shortly after hatching, while others, like those nesting in trees, have helpless hatchlings that require parental care for an extended period. For humans, dietary considerations might suggest removing chicken skin, which is often higher in fat, to promote health.