Now Dudgy is not a child anymore. He is grown up now and has his own mind. Then Dudgy is researching about what he thought when he was a child. “Why do all the ducks have to swim?” First of all, he must find some information for researching this. So he asked his mother “Mummy, why do all the ducks have to swim?” Dudgy’s mother said “Because ducks have to find food to eat in the water such as the aquatic plant, some small fish etc. So if we can’t swim, we can’t find food to survive too.” After Dudgy heard that he understands now. All the ducks have to swim.