Fascinating Video of Nest Being Built

Whether you're a bird person or not, this is stunning!!! Not to detract from the sheer magic of it, but in practical terms, how M A N Y trips would a bird have to make with that tiny little quantity of mud/clay it could carry? If you take the construction of a circular bowl in your stride as instinctive, consider how the bird comes up with the windbreak/entrance design that shields the eggs/chicks from the elements and at what point in fashioning the bowl do they start to construct it?

Watch the slideshow here:
Slideshow of birds building mud nest

Photos by: Daniel Carbajal Solsona.
Video by: fabianno de Lucca.
Text by: Daniel Carbajal Solsona.