Amos and Andy are goats, and have natural instincts. One of which is head butting.
It is amazing to me. They somehow have programmed into their DNA that if they gain height, they gain power, and make their head butts more forceful. They were fighting for the attention of their momma.
As for the run-in shed, Earl and I drove into town where I spent almost $100 on hinges for the shed doors, only to return home without the screws to put the doors together. I really need to make lists.