Many bird species migrate at night, including songbirds, shorebirds, herons, and ducks. These nocturnal migrations can begin as early as late summer, when weather conditions are more favorable for observation. Birdwatchers and researchers often listen for the unique calls of these birds, such as the "Ti-di-di" of some songbirds or the "kroak, kroak" of others. These sounds can be recorded and analyzed using tools like microphones and parabolic reflectors, which help capture distant calls more clearly. These recordings are usually examined the next morning, often using sonagrams—visual representations of sound that show frequency and duration. Identifying birds through sonagrams can be more complex than traditional visual identification. While visual identification relies on seeing a bird’s features, sonagrams require interpreting patterns in sound. Some species, like the ortolan warbler, have drawn particular interest due to their role in rural bird populations and their conservation status. In August and September 2022, repeated listening sessions identified a range of species, including the grey pipit and grey heron. On August 13, 2023, researchers identified a little bittern through sound recordings and sonagrams—a species that is rarely seen during the day. With the rise of digital tools, identifying birds by their calls has become more accessible. Applications like Merlin Bird ID use artificial intelligence to recognize bird calls and songs, making the process faster and more accurate for some users. However, these tools are not always 100% reliable and may not work well in all environments or with all species. Despite these limitations, the use of technology is helping more people engage with and understand the nocturnal world of birds, expanding the reach of birdwatching beyond traditional methods.