My Calls are almost 8 weeks, I believe. I'll have to try it once the little ones start being crazy messy (at least 1 week old, probably more). These Aztec's are some wild little ones! They're 2 days old and all of them have already mastered jumping on top of their heat plate. They're only sleeping under the heat plate at night. Otherwise they're all piled up on top. I do remember Lylah was jumping on top of it early on, but not this early. Some of the Aztec's started jumping up there shortly after they were walking around well. My big ducks didn't do this until around a week and a half to two weeks. Ducklings grow up way too fast.I put my little week old babies in with with the Cinco de Mayo babies, and they harassed them a tiny bit at first, but then they forgot.