What is this?
beaver dam
arch
nest
tree trunk
What is this?
pillar
bridge
cave
arch
What is this?
cave
nest
skeleton
eggshell ( shell )
What is this?
cave
nest
arch
beaver dam
What is this?
shell
tree trunk
ladder
skeleton
What is this?
basket
ladder
stairs
castle
What is this?
bridge
arch
castle
ladder
What are these?
stairs
pillar
bridge
ladder
What is this?
pillar (column)
stairs
arch
castle
What is this?
bridge
castle
pillar (column)
arch
What is this?
bridge
castle
house
arch
What is this?
tree house
tree trunk
tree root
tree branch
What is this?
cave
shell
eggshell
nest
What is this?
bag
book
basket
box
What is this?
book
box
basket
bag
What is this?
arch
cave
pillar (column)
tent
