As we all know, birds have nests and made it from twigs and leaves by themselves. These nests already serve as their home too. So, why not help them live in a more comfortable manner but still keeping it in a natural way by giving them a hardwood home but made of sustainable materials. That is what the Corchito is all about. It is a hard wood birdhouse made of 7 pieces natural cork and can be easily assembled like that of a 3d jigsaw puzzle. The only difference is in assembling puzzle you are playing, while with this birdhouse you are helping the birds living in a more comfortable zone.
Source : Corchito via Interior Design Roomand noquedanblogs
Unfortunately cork is getting scarce. So it's NOT so eco friendly.