"Clangers (usually referred to as The Clangers)[2] is a British stop-motion animated children's television series, consisting of short films about a family of mouse-like creatures who live on, and inside, a small moon-like planet. They speak only in a whistled language, and eat green soup (supplied by the Soup Dragon) and blue string pudding."

Sounds like early 70s.

"The programmes were originally broadcast on BBC1 between 1969 and 1972, followed by a special episode which was broadcast in 1974."

What else!

I'll have what those 1970s British stop-motion animators are having. Make it a double!