linguistic:voice_change
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Attenborough became Controller of BBC Two in March 1965, succeeding Michael Peacock. He had a clause inserted in his contract that would allow him to continue making programmes on an occasional basis. Later the same year he filmed elephants in Tanzania, and in 1969 he made a three-part series on the cultural history of the Indonesian island of Bali. For the 1971 film A Blank on the Map, he joined the first Western expedition to a remote highland valley in New Guinea to seek out a lost tribe.

BBC Two was launched in 1964, but had struggled to capture the public's imagination. When Attenborough arrived as controller, he quickly abolished the channel's quirky kangaroo mascot and shook up the schedule. With a mission to make BBC Two's output diverse and different from that offered by other networks, he began to establish a portfolio of programmes that defined the channel's identity for decades to come. Under his tenure, music, the arts, entertainment, archaeology, experimental comedy, travel, drama, sport, business, science and natural history all found a place in the weekly schedules. Often, an eclectic mix was offered within a single evening's viewing. Programmes he commissioned included Man Alive, Call My Bluff, Chronicle, Match of the Day, The Old Grey Whistle Test, Monty Python's Flying Circus and The Money Programme. With the advent of colour television, Attenborough brought snooker to the BBC to show the benefits of the format, as the sport uses coloured balls. The show – Pot Black – was later credited with the boom of the sport into the 1980s.

One of his most significant decisions was to order a 13-part series on the history of Western art, to show off the quality of the new UHF colour television service that BBC Two offered. Broadcast to universal acclaim in 1969, Civilisation set the blueprint for landmark authored documentaries, which were informally known as "sledgehammer" projects. Others followed, including Jacob Bronowski 's The Ascent of Man (also commissioned by Attenborough), and Alistair Cooke 's America. Attenborough thought that the story of evolution would be a natural subject for such a series. He shared his idea with Christopher Parsons, a producer at the Natural History Unit, who came up with a title Life on Earth and returned to Bristol to start planning the series. Attenborough harboured a strong desire to present the series himself, but this would not be possible so long as he remained in a management post.

While in charge of BBC Two, Attenborough turned down Terry Wogan 's job application to be a presenter on the channel, stating that there weren't any suitable vacancies. The channel already had an Irish announcer, with Attenborough reflecting in 2016: "To have had two Irishmen presenting on BBC Two would have looked ridiculous. This is no comment whatsoever on Terry Wogan's talents." Attenborough has also acknowledged that he sanctioned the wiping of television output during this period to cut costs, including a series by Alan Bennett, which he later regretted.

In 1969, Attenborough was promoted to director of programmes, making him responsible for the output of both BBC channels. His tasks, which included agreeing budgets, attending board meetings and firing staff, were now far removed from the business of filming programmes. When Attenborough's name was being suggested as a candidate for the position of Director-General of the BBC in 1972, he phoned his brother Richard to confess that he had no appetite for the job. Early the following year, he left his post to return to full-time programme-making, leaving him free to write and present the planned natural history epic.

After his resignation, Attenborough became a freelance broadcaster and started work on his next project, a trip to Indonesia with a crew from the Natural History Unit. It resulted in the 1973 series Eastwards with Attenborough, which was similar in tone to the earlier Zoo Quest; the main difference was the introduction of colour. Attenborough stated that he wanted to work in Asia, because previous nature documentaries had mostly focused on Africa. That year, Attenborough was invited to deliver the Royal Institution Christmas Lecture on The Language of Animals. After his work on Eastwards with Attenborough, he began to work on the scripts for Life on Earth.

Due to the scale of his ambition, the BBC decided to partner with an American network to secure the necessary funding. While the negotiations were proceeding, he worked on a number of other television projects. He presented a series on tribal art (The Tribal Eye, 1975) and another on the voyages of discovery (The Explorers, 1975). He presented a BBC children's series about cryptozoology entitled Fabulous Animals (1975), which featured mythical creatures such as mermaids and unicorns. Eventually, the BBC signed a co-production deal with Turner Broadcasting and Life on Earth moved into production in 1976. In 1979, he visited China and reported to the West for the first time about China's one-child policy.