Ep 45. Bumble Fumble

The gang discover a giant spotted egg which Owl identifies as that of a Bumblebird so they set off on the train for the snowy mountains, where Owl assumes the 'mother' role of handling the egg. Their train is hijacked by Evil-Robot-With-A-Computer-For-A-Brain (Egbert) who causes the egg to roll down the hill until it stops at a nest and hatches, and Poppy presents the new chick to the near-sighted Mother Bumblebird.