Every animal has a story...and so does the staff at the San Diego Zoo.
Skyscrapers towering over cities or spectacularly-designed bridges often come to mind when we think of great feats in architecture. However, some of the most amazing structures on earth are not man-made or urban at all, but residences built by animals in the natural world.
Produced by THIRTEEN ©2014 Educational Broadcasting Corporation. All rights reserved.
PBS is a 501(c)(3) not-for-profit organization.