So I went to TSC today to get some Americanas they had. Took my sister, bad choice number one. She saw the ducklings and wanted one. They are so cute, I couldn't resist. So we ended up with six Americanas and two ducklings. My question is how long can they stay in the same brooder together, if at all? I have another light I can use if needed, but would much rather prefer if they could stay together that they could. I know some people keep them together, at what point should one separate them?