How do bird parents decide which baby to feed first?

Bird parents typically prioritize feeding their chicks based on their size, health, and vocalizations. The loudest and most vigorous chicks often receive food first, as they signal their hunger and need for resources more effectively. Additionally, parents may instinctively choose to feed the weakest or smallest chick to ensure its survival, balancing the needs of all their offspring. This behavior helps maximize the overall survival of the brood.