The Iron Chicken called the Sky-moos to the Clangers' aid when their planet became covered with green plants. Since then the Sky-moos have often called on the Clangers. They just come to say hallo and pass the time of year, but they secretly hope the Clangers will one day grow another huge field of green plants for them to eat, because Sky-moos are great eaters of greenery and there is a shortage of green vegetables in space.

N.B. using ears as wings is only possible in low gravity conditions (not recommended on earth)