Video: Three Bear Cubs Rescued from a Dumpster

Most of the time it's best to let mother nature do her own thing. But sometimes it's nice to offer a helping hand, like in this video from LiveLeak in which three little bear cubs are stuck in a dumpster.

You have to give the good samaritans props, they had the wherewithal to help the situation without aggravating mama bear.

My question is how did those cubs get in there in the first place?