This is a barn swallow video from the USA.
From the Cornell Lab of Ornithology in the USA:
NestWatchers Needed For New Barn Swallow Study
We live in an incredibly well-lit world. All that wattage in heavily-populated areas creates a halo glow that brightens the night sky. Researchers at the Cornell Lab of Ornithology, Syracuse University, and Globe at Night are seeking participants for a unique new study. Scientists want to know what impact all that extra night light might have on the circadian rhythms of life using Barn Swallows as their subjects. Barn Swallows have adapted to live near humans and nest almost exclusively on structures such as bridges, homes, and yes, barns. Volunteers can sign up through NestWatch.
“Specifically, we’re hoping to learn if the artificial light has an effect—good or bad—on what we call the ‘pace of life,’” says Cornell Lab of Ornithology researcher Caren Cooper. “It’s been established that creatures that live in areas where daytime is shorter during breeding, such as the tropics, have a lower metabolism and a longer life span. On the flip side, animals that breed where there is more daylight tend to have a faster metabolism and shorter life. Is the pace of life for Barn Swallows increasing if they live in areas where the days seem even longer due to artificial lights?”
“Previous studies have shown that birds living in areas with artificial light at night start singing well before dawn, start eating earlier, eat more during the day, and have more complex social interactions,” says researcher Margaret Voss at Syracuse University. “Expanding those activities takes its toll in energy use. We want to learn how that might play out when it comes to health and survival as the Barn Swallows build nests and raise their chicks.”If Barn Swallows nest near you, get involved in the Barn Swallow project. Sign up to learn more about how the study is being carried out through NestWatch and Globe at Night.
Barn swallow nest at Ecomare museum, Texel, the Netherlands: here.