These nests were built in amazing places, which, as it were, suggests that birds are able to adapt to a wide variety of conditions. It used to be thought that the ability to build nests was an inherited skill, but recent research has shown that birds are able to improve.
The development of agriculture and urbanization led to deforestation, and the number of natural locations for building nests has decreased. However, the birds do not give up, these pictures are evidence of this.