Releases also have nicknames, decided upon by Mark Shuttleworth, and humorously derived from types of animals. 8.04 has the nickname Hardy Heron. 8.10 is called Intrepid Ibex. Sometimes the animal component is dropped in formal conversation 8.04 is referred to simply as “Ubuntu Hardy”, or just “Hardy”.
Version number Nickname Updated until
4.10 Warty Warthog April 2006
5.04 Hoary Hedgehog October 2006
5.10 Breezy Badger April 2007
6.06 LTS 1 Dapper Drake June 2009
6.10 Edgy Eft April 2008
7.04 Feisty Fawn October 2008
7.10 Gutsy Gibbon April 2009
8.04 LTS Hardy Heron April 2011
8.10 Intrepid Ibex April 2010
9.04 Jaunty Jackalope October 2010
source:http://linuxpoison.blogspot.com/2010/08/135781677514466.html