Birds sing mostly at sunrise because it is at this moment that the activity of predators is reduced and the weather conditions are ideal for sound propagation, allowing birds to announce their territory and attract a partner for reproduction.
Birds sing particularly at sunrise due to an increase in certain hormones, such as testosterone, which stimulate their desire to sing in the morning. After a night of rest, their energy reservoir is at its maximum, making it easier for them to sing and giving them vocal energy right from the first light of day. This morning period also corresponds to the time when their metabolism restarts, activating all their bodily functions, including the vocal cords. Moreover, a powerful and energetic song at sunrise generally indicates good health and optimal condition, sending a clear and strong signal to potential mates or rivals.
Birds take advantage of the morning song because the sound environment is often quieter and clearer at dawn. The night has passed, but human activity has not yet resumed, making their singing much more audible. There is also less wind early in the morning, which promotes clear sound propagation and helps birds to be heard by more distant peers. Less human noise (traffic, construction, daily activities) means that the sung message comes through better, and sound signals travel farther with less energy expended. It is therefore an ideal time to capture the attention of mates or to clearly assert one's territory.
At sunrise, birds use their songs to mark their territory. It's their way of telling the neighbors, "This spot is already taken, don't come too close!" In the morning, the calm atmosphere also allows sound to travel better and farther, so naturally, they don't hold back in sending their messages to potential competitors. These songs also indicate to other birds their health and vigor, clearly showing who is the boss in the area. Some use this moment to attract partners, showcasing their vocal best to impress and stand out from the very first light of day.
When the first rays of sunlight appear, they often trigger a strong vocal activity in birds. This increase in singing is linked to the direct influence of natural light on the bird's brain, acting as a kind of biological alarm clock. Morning light stimulates the secretion of hormones like melatonin, which regulate their daily rhythm, resulting in an almost irresistible urge to sing loudly. Birds also perceive the sunrise as a signal indicating good conditions for finding food and marking their territory vocally. Therefore, it is clearly the ambient brightness in the early morning that gives them that little boost to start their daily melodies.
The morning singing of birds is called the 'dawn chorus,' and it can start up to two hours before the actual sunrise, depending on the species.
The blackbird is among the first birds to sing at sunrise, often as soon as the sky begins to brighten.
Studies show that male birds singing particularly early and loudly are generally perceived as the most robust by females, thus increasing their chances of attracting a mate.
Birds have a structure called a syrinx that allows them to produce two different notes simultaneously, which explains why their songs can be so melodious and complex.
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