AMAZING
Structural engineer in action
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 NY trips would a bird
have to make with that tiny little quantity of mud/clay it could carry? (and how far from the
nest is the source?) 
If you take the construction of a “circular bowl” in your stride as instinctive – how the heck
does the bird come 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?
Structural engineer in action.

Even if you think you could build this?  Try it without using your hands!

Truly GOD’S creatures.