It means nothing other than the bird found a nice place for a nest. Some birds return to the same nest/area year after year.
It could mean that your house is in a paticaly safe area like high up not many preditors
A Cukoo Bird builds it's nest in a chimney
What if? You can't really do anything, just don't mess with the eggs or nest.
if you like bird feces
nest
cattle bird
The Weaver builds a nest out of grasses, with the entrance at the bottom.
The bird that builds a nest that looks like mud is called a mud dauber wasp.
Hummingbirds. The nest of the bee hummingbird, the smallest bird in the world, is only 3cm in diameter.
an eagle builds a nest called an aerie
penguins don't build nests
The nests of cave swifts are used in bird's nest soup.
Swallows? Swallows?