On the banks of rivers, lakes, ponds, and marshes, as well as in floodplain and coastal forests, among thickets of willow, reeds, and reeds, one can see bird houses resembling a bag with a tube sticking out of the side. These are the nests of a small bird called Remiz (Eurasian pendulines tit). Most often nests are placed at the ends of branches hanging over the water. The Remiz nest is about 17 cm high and 11 cm wide, with walls about 2-2.5 cm thick. Despite such thin walls, the nest is very...