Thanks all for your comments.
Elsa I think the shape is due more to the breed than the abundance of food, but I am no horse expert.
Thanks Jakov, always a pleasure to read your kind words
Børge, these animals are quite habituated to humans. Even an area as unihabited as the Carneddau sees relatively many people compared to real wilderness in America or Northern Europe.
These animals were domesticated for centuries and only relatively recently the went "wild", and still had plenty of contact with humans tendong to them in some way. So they are not as skittish as normal wildlife. I have not tried to get very close to them though; besides they had a young foal and I did not want to trigger some defense response.