Red-rumped swallow chicks waiting in the nest for its parents to return.
ひなっぴ*1
Commonly found in urban areas, the nests of the red-rumped swallow are often found on the eaves of concrete public facilities such as schools, nursing homes, gymnasiums, city halls, fire stations, etc. The nesting material is mud, and after the foundation is made above the ventilation hole, the nest hole eventually extends to the ceiling.
So, which parts of the nesting material are most likely to be destroyed by strong winds?
A: The ceiling *2
It's swallow season in Japan, and you can hear the cute cries of swallows.
*1:Hirundo daurica https://en.wikipedia.org/wiki/Red-rumped_swallow
*2:The foundations are less likely to weather even after decades, so if you want to find traces of old nests of Red-rumped swallow in urban areas, it's easy to find them by checking whether there is mud on the ceiling from above the ventilation openings.
