I do not keep Maran's but here they are not super heat tolerant.
hope that things cool off and your dark marans improve, Amy Beth! that must be incredibly frustrating, and worrisome, to be having such health troubles.
i have two cuckoo marans (in my small flock of six), and they definitely pant sooner/more than the others -- but i'm both relatively close to the coast (30 miles or so) and at a high-ish elevation (1625'), so it doesn't get quite as hot here as down in the valleys (or up in the sierra foothills), we've only been in the low-mid 90s at the highest.
and funny, the marans are the best fliers of the flock, so far -- one (Dixie) now routinely hops onto a lap or shoulder to check things out (doesn't want to be handled, though), and yesterday actually flew up about 5 of 6 feet into the base of one of my giant oak trees! adventurous girl!
on my lap, apparently interested in reading the New Yorker:
up in the oak tree -- she looks as startled as i was!
they are also now totally into free-ranging around in the late afternoons/early evenings when there's more shade -- lots of exploring going on, and the two cats and i just sit by & watch with amusement...

Thanks so much guys! I gave them fresh water like 3 times today to keep it cool for them. I hope it helps.
