Authorities at a US prison are happy a 400lb bear is roaming the grounds of their prison - because they view it as an extra layer of security. Warden Burl Cain, of the Louisiana State Penitentiary, said: "I love that bear being right where it is. "I tell you what, none of our inmates are going to try to get out after dark and wander around when they might run into a big old bear. It's like having another guard at no cost to the taxpayer." Prison officials believe they have eight to 10 bears on the grounds, said Gary Young, head of the executive management office at the prison. The last recorded escape at the prison was nearly three years ago, and the inmate was quickly recaptured before leaving the grounds.