I have a Marans half-breed, Honker (named for the sweet sound of her voice), who regularly lays a normal dark-shelled egg, then a rubber egg on the same day. Then she goes days and days not laying, then lays another normal and rubber egg. This has happened over and over.
I'm glad I found this thread, too, so I know it's not my imagination. I wish there was a way to prevent those rubber eggs, though! The rubber egg is always the second one that she lays.

I'm glad I found this thread, too, so I know it's not my imagination. I wish there was a way to prevent those rubber eggs, though! The rubber egg is always the second one that she lays.