The original clucking-bunny ad showed a white rabbit crouching and wiggling its nose, with a dubbed human voice saying "buck-buck-buck-buck..." synchronized with the nose-wiggling. The bunny then hopped away revealing that it had just "laid" a Cadbury egg.

The Cadbury Bunny is popular enough here to have inspired a tie-in toy: a plush bunny with a button inside its paw that one squeezes to hear the "buck-buck-buck" sound! Its nose doesn't wiggle, though. Cadbury sells it with a couple of eggs included in its packaging.