Overview: The BBC's favourite wildlife presenters look back through the archives as they share their most memorable adventures in Britain and Ireland. Chris Packham remembers a recent filming trip where he had the privilege to spot some extremely rare birds circling the skies above his home county of Hampshire - white-tailed eagles. Gordon Buchanan recalls joining a fishing trawler to film killer whales off the coast of Shetland, while Vianet Djenguet describes his first sight of a cuckoo in Norfolk and Steve Backshall recalls filming seahorses.