Iolo Williams explores Monmouthshire. He looks for a rare bee on the Gwent Levels and finds fallow deer in the Wye Valley, as well as a heavily-camouflaged bird near Abergavenny.

Iolo Williams explores the borderlands of Radnorshire, searching for nesting birds along the Wye, dormice and roe deer in its woodlands, and yellowhammers on Offa's Dyke.

Iolo Williams explores Montgomeryshire. He looks for endangered curlews, visits rare habitats, walks ancient routes and finds wildlife along a canal.

Iolo Williams explores north east Wales and finds threatened moorland birds, discovers amazing wildlife on a fascinating bog and looks for lizards and shorebirds along the coast.