大象传媒

Iolo Williams revisits some of his favourite filming locations in Wales to see what has changed over the last 15 years.

Here, he looks at conservation success stories, from the revival of otters in Welsh rivers to the preservation of red squirrels on Anglesey.

He starts with a look at one of his favourite birds, the hen harrier, which in the 1990s appeared to be on the brink of extinction.