Looked like they were photographing somewhere like The Burren, Bags. Little patches of vegetation (they are not just mosses, you can see, a whole load of stuff, some flowering I think), each one a mini ecosystem in an island of bare limestone. Such ecosystems might be common in Scotland but the Burren is certainly considered to be a treasured, rare and delicate habitat in Ireland. They appeared to have peeled off a big patch - it might settle back down, it might not.
(Gosh we are both in full arguing mode today aren't we bags - but we agree about the siskins, on twitter
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