Iolo goes back ten years to 800 ravens roosting in Newborough Forest, Anglesey, and their extraordinary calls. He recalls a visit to Grassholme Island in 1996 to see a colony of over 100,000 gannets. Show more

Iolo discovers a barn owl in a tree hole with chicks at Penrhyn Castle, thousands of mining bees nesting on grassland in Pontypool Park and long-tailed tits feathering their nest in Singleton Park. Show more

Iolo remembers finding lizards and slow worms on country lanes in Snowdonia. He recalls watching a kestrel take a lizard while walking the Ceredigion coastal path between Cwmtydu and Llangrannog. Show more

Iolo recalls one of his first appearances on TV back in 1996 in which he was looking for black grouse on Ruabon Mountain. He also remembers heading to Scotland in 2003 to film mating golden eagles. Show more

Iolo Williams delves into the archives from the past 25 years of filming in Wales and discovers barn owl chicks and dormice. Show more

Twenty years ago, Iolo filmed water voles in the Glaslyn valley of Snowdonia. He returns to the same water channel to see if they are still there. Show more

Iolo goes river dipping in the Severn, encounters frogs in a freezing stream and a family of otters on Stackpole ponds. He recalls filming short-eared owls hunting on waste ground in Kinmel near Rhyl. Show more

Iolo recalls looking for black-throated divers in the middle of a Scottish thunderstorm and tracking a great grey shrike in a blizzard in the Brecon Beacons. Show more