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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 of material ?)
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
