unusual ones
i don't believe that giraffes build homes.
Most of the homes are made out of brick and or stones. Many of the homes are large with over four bedrooms. Many homes were build as custom homes many, many years ago and don't have curbs.
They used spears, bows and arrows they hunted animals with these weapons and then used their skins to build homes.
commensalism
Birds don't build a shelter to live in. They build nest only for hatching eggs any other time they live in trees, hedgerows etc.
The early Dutch settlers in American colonies built homes influenced by architecture of the Netherlands. The homes were made of brick with a rounded roof.
Quasars are the unusual type of active galaxy in the universe.
Depending on the location you have to build a house in the mountains, almost any type of house will work. Multi-level houses are often built to follow the contour of the mountain. The slope of the land and stability of the site can make a difference on the type of house you build.
Yes, in some cases you can build on reclaimed land. This will vary depending on which type of land is being reclaimed. Land that housed a garbage dump is often reclaimed for woodlands rather than for homes.
simple homes
It depends on what type of birds you are talking about...
in the rural area- typical Balkan type of homes, in the towns/cities news homes are pro-european type