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Despite their cute appearances, they are both very troublesome and love to cause mischief, but Pingu is able to get them to behave when he catches them messing about.
The Twins have a strong resemblance to Pinga; they both are black, grey and white round penguin (an appearance similar to an emperor penguin chick) with orange feet and a red beak.
Although they look quite like her, they have certain differences capable of distinguishing them: they wear nappies, a baby boy penguin has a flick of hair, and both suck dummies of different colors (blue and pink).
It is possible that their dummies reflect, in fact, their genders. In this case, the one with the blue dummy is a male and the one with the pink dummy is a female.