This sound is from David Attenborough Soundboard

Attenborough was a senior manager at the BBC, having served as controller of BBC Two and director of programming for BBC Television in the 1960s and 1970s.
See also: David Attenborough filmography, Richard Attenborough, RRS Sir David Attenborough, John Attenborough, Will Attenborough, and David Attenborough: A Life on Our Planet.