Iolo Williams delves into the archives to see the fantastic wildlife that he's filmed in Wales during the past twenty-five years. He also explores the changes he's seen in Welsh wildlife in that time. In this episode, he remembers finding lizards and slow worms on country lanes in Snowdonia back in 2000. Also watching a kestrel take a lizard while walking the Ceredigion coastal path between Cwmtydu and Llangrannog, and bottlenose dolphins hunting for fish off the Mwnt. Iolo also digs up his best scuba dives. Off the Pembrokeshire coast, he found an extraordinary congregation of giant spider crabs mating, a huge sea cucumber and fantastic coral fans. Twenty meters below, off the Lleyn Peninsula, he found a thorny Mediterranean mantis shrimp burrowing on the sea bottom, which can cause a lot of pain. And one of his favourites, a night dive off Cricieth beach. Other gems from the archive include rock pool wildlife in Oxwich Bay, singing birds, and the best view ever of a peregrine nest at South Stack, Anglesey.