12. Lucid Lynx (10.04 LTS)
Flickr image credit: dynamosquito
There are four lynx species of medium-sized wildcats, and they're distinctive for the tufts of black hair atop their ears. Lynxes also sport a ruff under the neck with black bars that resemble a bow tie.
Are lynxes lucid? Well Ubuntu 10.04 certainly was when it debuted in April 2010. Representing the third Long Term Support release, Lucid Lynx switched to the new “Light” theme and improved driver support. This version of Ubuntu is still supported, and will be through April 2013 for desktop users.