Chris Packham gets close to puffins on the island of Skomer.
Visiting the island of Skomer, Harlech Castle, Porth Oer and Gower Peninsula.
Iolo Williams takes to the water to reveal puffins at their best - diving for fish.
Martin Hughes-Games reports on some of your surprising wildlife stories.
Iolo Williams reveals the strange night-time goings-on of the Manx shearwater.
On Skomer Island, Iolo Williams unveils the newest stars of the series - puffins.
A look at the decommissioning of the Trawsfynydd nuclear power station.