"There are a lot of Mo followers online, and he definitely received a large number of votes, however I think Captain's efforts in renovating his burrow recently, and generally being a good penguin, touched people's hearts," she said.
"I'm sure there will be some interesting comments from fans of Mo coming through our social media channels in the next few days."
More than 15,000 votes, a new record, were cast this year, in New Zealand, the USA, the UK, Australia, Turkey, Costa Rica, Estonia, Venezuela, Trinidad and Tobago. There was also a significant spike in votes from Vietnam over the last couple of days.
And it wasn't entirely frivolous.
"This is a way to educate our followers, and people across New Zealand and the world, about the challenges little blue penguins and other wildlife face, and how we can help protect them," Giddens said.
"Sharing the stories of our little penguins and how they came to live at the National Aquarium creates a greater understanding about conservation."
All the penguins at the National Aquarium of New Zealand needed help from specialist staff after being abandoned as chicks, injured in dog attacks or becoming sick in the wild.
The facility was a rehabilitation centre for little blue penguins, assisting with recovery and returning them to the wild, although some were not strong enough to return to their natural habitats, so made a permanent home there.