the universe's oldest blueprint, drawn by birds who never took an architecture class.
means The instinctive act of arranging and preparing a home or space, often with care and comfort in mind — whether by birds building a literal nest or people feathering theirs before a big change.
from From the Old English 'nest,' the same word birds have answered to for over a thousand years, tracing back to a Proto-Indo-European root meaning roughly 'to sit down' or 'settle.' The verb 'nesting' simply put that snug noun into motion, and over time it stretched beyond birds to cover any creature — or expectant parent — gripped by the urge to tuck things into place. The figurative 'nesting instinct' in humans is a much newer borrowing, lifted straight from the birds who'd been doing it all along.
russian nesting dolls — matryoshka dolls from russia, typically 5-7 wooden figures nested inside each other
bald eagle nesting — largest stick nests in north america, with reelfoot lake tennessee nest weighing 2 tons
sociable weaver colonies — massive communal nests in kalahari desert, africa, housing 100+ bird families in single structure