Well, one hen has started laying anyway. I went to check on the chickens this morning and I found two small eggs which look to be from the Ameraucana. The shells and membrane were quite robust. I’ve heard that they can start out thin, sometimes even laying an egg with no shell at all. These were just fine.
The Ameraucana is 20 weeks old now, so she’s more or less right on schedule. The other girls are 19 weeks. I expect the Red ought to begin laying pretty soon, but the Marans and the Buttercup may take longer.