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For avid 'BBC SpringWatch' or 'AutumnWatch' viewers, naturalist and broadcaster Iolo Williams won't need much of an introduction. The affable Welshman has been showing us around wild places in Wales over several series of the popular wildlife show on BBC2. Iolo will take you on a tour of his homeland, from mountain tops to seashore. On the way you'll meet disco-dancing black grouse, Britain's largest spider, a sex-changing fish and many more beauties and curiosities of nature.