The Musendrophilus    (April Fool's Day - 1975)

The naturalist David Attenborough gave a report on BBC Radio 3 about a group of islands in the Pacific known as the Sheba Islands. He played sound recordings of the island’s fauna, including a recording of a night-singing, yodelling tree mouse called the Musendrophilus. He also described a web-footed species whose webs were prized by inhabitants of the island as reeds for musical instruments.