I found this list and think it is a good referance. It says cherries are ok just not the pits. So if you take the seeds out you should be fine.
Here is the website: http://www.poultryhelp.com/toxicplants.html#C
Mine eat the cherry trees drop by the pile in season. They get cherry juice all over themselves and look like----well-----that they are packing for freezer camp. Wild cherrrys and a major part of there free-range in season.
I just give them the whole cherry and they eat around the pit with no problem. It never occured to me that cherry pits might be poisonous or a chocking hazard, but they might be. If your worried they might swallow it or have a hard time eating it with the pit, you can just cut it in half and remove the pit or pop it out with a cherry pitter. Sometimes I take the pit out and fill the spot where it was supposed to be with a treat, they love it!