Ducky is Smurfette's adoptive duckling who appears in "The Smurfs Springtime Special". It all started when Clumsy and Brainy have found what they thought was an Easter Egg, but after the egg has been bought back to the Smurf village, it started to hatch and thus Ducky popped out! After his egg has been hatched, he tries his first steps but falls, having Smurfette to take care of him. (to which Papa Smurf tells her that the duck thinks that she is his mother, as she embraces him dearly).
Later, after the snow has piled up in the village (as Gargamel has planned to capture the Smurfs by putting Mother Nature to sleep), Papa and the others went off to find Mother Nature. But as Ducky wants to join in, Smurfette tells him to stay, causes him to feel left out. Althought not long after they arrived at Gargamel's hovel to free the other Smurfs (while Papa makes up a potion to wake up Mother Nature and break the sleeping spell), Ducky runs down into the arms of Smurfette, much to her sympathy. However, as Papa tries to get up the hill to reunite with all the Smurfs, he falls down, causing Ducky to join in to help him, only to also fall down the hill. Papa tries to pull him back up, just as Balthazar makes a direct hit with his musket. (Not directly at Papa, but at Ducky instead) Thankfully Papa is saved, but Ducky isn't so lucky to make it, having Smurfette to cry for his death.
In the end, however, all is normal and Mother Nature has cured the duckling; thus bringing him back to life - much to Smurfette's delight and all the Smurfs and the duckling dancing happily together in springtime.