BBC News snip:
A black bear ended up with more than a sore head when it activated automatic doors and wandered into a US hospital. Startled doctors, nurses and patients saw the 345lb (156kg) animal walking through the emergency ward and into an office full of computers.
Two police officers trapped the bear inside and decided the best option was to shoot it dead rather than try to sedate it and risk an escape. No-one, apart from the bear, was injured at the Virginia hospital.
"I was walking down the hallway and there was a big, black bear coming towards me," security guard Dan Thompson said. "He turned and went into the office on the right hand side. I'm glad he did."
It seems that when the full-grown bear walked in front of the Carilion Franklin Memorial Hospital in Rocky Mount, Virginia, it triggered a sensor that opens the building's doors.
More:
http://news.bbc.co.uk/1/hi/world/americas/3818747.stm