Penguins are really cute! But Captain Jack told Yotsuba all about, uhm... Flappy Space Waterwings and McBoy! [...] And there was a Penguin Tower, a Tower of Penguins! Penguins can balance on top of each other and be super strong, you can't knock them over!

[She might not remember all of the story exactly, but that's the gist of it. Sort of.]