Iolo Williams explores four historic estates in Wales, finding out what special places they are for wildlife. These parks are now open for everyone to enjoy but sometimes the wildlife goes unnoticed. Iolo meets with people who have inside knowledge to share, uses his expertise as a naturalist to track down wildlife and finds elusive night time creatures. In this second episode, Iolo is exploring ancient Dinefwr Park in the beautiful Carmarthen countryside near Llandeilo. He tracks down rarely seen lesser spotted woodpeckers, uncovers the wealth of wildlife found in Dinefwr's special ancient trees and gets up close to brown long eared bats and badgers.

• Iolo Williams