This may have already been discussed on here, but with over 7800 post I haven't them all.
Here's the question; Are all Marans poor foragers or just mine? I have 8 blues and 4 black and they are the worst foragers I've ever seen. Open all the coops in the morning and my buff orpingtons, barred rocks and Red sex link take off like a billet to get to the pasture. The Marans just wonder around for an hour or so then go back in the coop and hang around the feed bucket... What gives?
My Marans forage just fine. Are your Marans low on the totem pole? I find my younger birds flock to feeders when the bigger more dominant birds leave the run to forage....just a guess here.