butterflies have spots.

Error message

  • Notice: Trying to access array offset on value of type bool in refresh_node_load() (line 187 of sites/all/modules/refresh/refresh.module).
  • Notice: Trying to access array offset on value of type bool in refresh_node_load() (line 189 of sites/all/modules/refresh/refresh.module).
I noticed: 

butterflies have spots.

Great observation!  These are called "eye spots" since they look like eyes.  Having huge fake eyes on your wings is a good way to scare away predators since they look more like a large bird or maybe even a snake than a butterfly. Look for owl butterflies in the conservatory, they have some of the best examples of eye-spots around!