Baby ducks
The Baby Ducks are minor characters which appear in the episode "Comfort Schmumfort". They are a trio of cute yellow baby ducklings wearing space helmets that are in the middle of outer space for no reason. 

In the episode, Molly is chasing after the aliens in her rocket, the baby ducks are shown walking across a "baby duck crossing", the aliens see the adorable ducklings and decide to stop.

Sleemoth pulls the emergency break, Molly is then flying out of control and can't stop the rocket. Molly screams and the rocket crashes into the spaceship and blows up, where she is later revealed to survive the crash.