When I saw this bird below on reddit:
I demanded to know WHY BIRDS HAD TO DO THAT. charmian suggested that it was a nesting instinct, so I dug up my old pictures of one of my own stupidheads to prove that it was more likely a STUPIDITY INSTINCT.
"Hey, look! Something at the bottom of the glass! What the - mmmf…HOW DO I GET OUT NOW?"