is a nest of grass fundamentally different than one from sticks?
a robin's nest is often grass plastered with mud, but can also be sticks used the same way.
stick nests need to be interlocked to keep from falling apart, and this is often accomplished by both pocking sticks in and pulling on some to rearrange them
dealing with grasses could easily start with reeds that are stiff and gradually working down to the more flexible materials, where more time is spent pulling into place than pushing
once you are pulling and looking for maximum interlock, all you need to do is alternate sides ... weaving.
as for hanging, that could easily be a means to avoid predators that have to remain on tops of branches, as would being able to move out to the ends of flexible branches instead of staying in the crotches.
And if the bird builds the nest around itself then it will fit eh?
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