Okay, maybe a toss up between them and The Flumps.
[youtube]https://www.youtube.com/watch?v=wfsMZKwqw3w[/youtube]
They even turned up in Doctor Who.
[youtube]https://www.youtube.com/watch?v=dOK1YdWalOw[/youtube]
Famously, despite only speaking on swannee whistle, the Clangers had full scripts written for them, to then be "whistled" out…
[youtube]https://www.youtube.com/watch?v=-OvefhhMbbg[/youtube]
And now they are returning, after four decades, with a new series for CBeebies next year based on the Oliver Postgate-created[...]