Something tried to dig under the new hoop coop...@SageHill .... okay find the video for us now, don't leave us hanging.
I went the route of all separate pens years ago... had some real nice show birds... Then went to letting them run together except at breeding time and then separation... All depending to how many of what, as to how to do it. Also depends on the "agreeability" of the breeds and roosters. Some just DO NOT mix well.
I like the letting the hens mostly run together and then pulling for breeding with certain males. But... you sorta need a male or 2 for every 6-10 hens for "protection" of watching the skies etc for predators... to do the warning... Males develop better plumage when out running loose if they are not fighting amongst themselves. Tails do not get broken up against cage walls, dividers, etc...
They are happier out running loose... but AERIAL predators are the problem during the day... ground predators are more persistent at night. If you have a "chicken proof" dog that can coexist in fields, yards etc with chickens, they are your best bet for some protection.
I like to have them out together if they get along and if I am not breeding. But I do have to deal with hawks and eagles..... as well as dogs, coyotes, foxes, possums, skunks, raccoons, you name it... lost several here at the house over the last couple of years... and most were "lost " during the day... and there was one less chicken type hawk here this past year. I think the mate left since I did not see it but once or twice, after the first one disappeared... Am not at all sorry they are gone..
HAVE to lock in at night.... @fuzzi guards against ones digging in/under, with her wire on the outside etc on the ground.... I like to lock in a "coop" or building of some type. I will have some sort of more "weather proof" coops for the winter... these larger "pens" or chicken runs are fine for the warmer weather... and the tops are perfect to keep out any hawks etc...
Eventually I think it will be a mixture here again... especially with the fence getting put up to try to keep them more contained. But I do like the coops with attached runs to keep the breeds separate, and then let the different ones out loose for several hours at a time...
...it stopped digging after about 2".