More Structures in Nature

 Cave photo  
 A cave is like a ...  tent.
   
 A spider web is like a ...  tower.
 
 A bird nest is like a ...  tree house.
 A turtle shell is like a ...  Volkswagen bug.
 
 Honeycomb is like a ...  jungle gym.
 STRUCTURAL CONCEPTS
 Structures in Nature  More Structures in Nature Beam & Column Structures  Arch Structures
 Cantilever Structures   Triangular Structures Bridge Types - Beam  Bridge Types - Arch & Suspension