Selling hamsters?

I read in BT some weeks ago that there was this guy who bred and sold hamsters as a source of passive income when he was a school student. How can breeding hamsters be a source of passive income? I am not disputing his story but breeding hamsters must be pretty laborious. I just cannot see how it can be treated as a passive income. For your information this guy has "arrived" i.e. has achieved financial freedom at an early age. Well done!




By the way, there is a site on achieving financial freedom which can found here http://ultimatefinancialfreedom.blogspot.com