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Iolo Williams explores four historic estates in Wales in this new series, 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 first episode Iolo is exploring busy Bute Park right in the heart of Cardiff. He has a close encounter with a green woodpecker, finds that it's the best place in Wales to see jays and discovers that it's not only dippers and salmon that can be found along the river Taff when he goes in search of evidence of otters.