Got a cage of guineas at auction a couple of weeks ago. It said chocolate & bronze. I brought home 2 chocolate & thought it was 12 bronze. Once I got the birds outside there are 2 that are a much lighter color than the bronze. More brown looking the black-- the bronze are almost the same color as my purples. hard to get a good pic. The 2nd pic is the brown color next to a bronze. Any thoughts? It has the same marks as the bronze & chocolate. Too dark for chocolate at this age & too light for bronze. the other chocolates are still the light tan color. These guineas are almost the exact size as mine that I hatched 4th July. What age do the chocolates get darker?