Why do many animals breed during seasons when food is plentiful and conditions are favorable for offspring?

Many animals have evolved to breed during seasons when food is plentiful and environmental conditions are favorable because this timing significantly increases the survival rate of their offspring. Because the period between birth or hatching and the attainment of maturity is often the time of greatest mortality, natural selection has favored individuals that reproduce at the most advantageous times.12

This seasonal breeding is regulated by a combination of internal biological rhythms and external environmental cues. For many species, the pituitary gland acts as a command center, responding to environmental stimuli such as increasing day length to trigger gonadal development. By synchronizing mating and birth with favorable seasons—such as spring, when temperatures are warmer and food resources are abundant—parents ensure that their young have the best possible chance to grow and reach maturity.13

Ultimately, individuals whose genetic backgrounds lead them to reproduce during these optimal periods are more likely to pass on their genes, which is why such seasonal or periodic sexual cycles have become a fundamental feature of reproductive behaviour across the animal kingdom.12