Hello, I have 4 hens that I bought when they were a week old. 2 RIR, 1 black australorp, and 1 araucana. They hatched on May 5th 2009. In October the RIR's started laying. I'm still waiting for the other 2 to start. Is this normal? The black australorp is on borrowed time if she keeps making so much noise . All 4 have equal sized combs and waddles. Any insight would be appreciated.