Well, Ubuntu "Raring Ringtail" was released today, so that can only mean one thing: it's Madagascar reference time! Skipper, the commanding penguin, refers to King Julien as "Ringtail", because he is a ring-tailed lemur, and Private, the youngest penguin, once played mini-golf under the name "Mr. Tux". Now, an OS named "Ringtail" has a kernel working at its core whose symbol is a penguin named Tux! This Ubuntu release is going to be the current one for the next six months, until 13.10 comes out.
Unfortunately, this doesn't quite fit together, as the OS's nickname refers to a ring-tailed raccoon, rather than a ring-tailed lemur. Oh well!
As for me, I'm a Linux Mint user, so it'll take a while for all those Raring updates to trickle down to this PC.