Turtle shell could be used as a roof in hurricane and tornado areas to prevent roof damage.
Arctic Fox fur is the best fur for retaining heat and could be used as insulator inside houses in colder regions.
The bone structure of a giraffe's neck is able to hold it's 600 pound neck so it would be great for the structure of a skyscraper.
Elephant trunks are very strong and could be used as the design for a crane. It would allow the crane to move more easily.
