David Attenborough series on the natural history of the polar regions; Attenborough appeared on screen and authored the final episode, in addition to performing voiceover duties. Attenborough introduced and narrated the Unit's first 4K production "Life Story." For "Planet Earth II" (2016), Attenborough returned as narrator and presenter, with the main theme music composed by Hans Zimmer. In October 2014, the corporation announced a trio of new one-off Attenborough documentaries as part of a raft of new natural history programmes. "Attenborough's Paradise Birds" and "Attenborough's Big Birds" was shown on BBC Two and "Waking Giants", which follows the discovery of giant dinosaur
David Attenborough 3D project, "Conquest of the Skies", made by the team behind the BAFTA-winning "David Attenborough's Natural History Museum Alive", aired on Sky 3D at Christmas 2014. Attenborough has narrated three series of "David Attenborough's Natural Curiosities" for UKTV channel Watch, with the third series showing in 2015. On radio, Attenborough has continued as one of the presenters of BBC Radio 4's "Tweet of the Day", which began a second series in September 2014. "Blue Planet II" was broadcast in 2017, with Attenborough returning as presenter. The series was critically acclaimed and gained the highest UK viewing figure for 2017, 14.1