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