鳥界的建築高手

Even if you think you could build this? Try it without using your hands!
就算你自認蓋一個這樣的鳥巢不難，試試看像這對鳥爸鳥媽一樣，不用手，只用嘴！

Not to detract from the sheer magic of it, but in practical terms, how MANY 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.