When a penguin does this to a human, it can signify general interest or trust. A Cooing Baby Chick Baby Adélie chicks like this one often make noises if they need something.

Feeling a little blue? Well, that can be a good thing, especially if you're a baby penguin at Adventure Aquarium.

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See Pesto the viral baby penguin grow up as he sheds brown feathers in new pics Pesto went viral in September because, well, he's an adorably big king penguin chick.

A Humboldt penguin chick hatched at Aquarium of Niagara, marking the fifth chick for parents Blanca and PJ Jr. Visitors can vote on the chick's new name.