Ollie, Syd and Millie was the Official Mascot for the 2000 Olympic Games in Sydney. Three native Australian animals chosen as mascots represent earth, air and water. They were designed by Matt Hatton and Jozef Szekeres.
"Olly", a kookaburra, epitomizes the Olympic spirit of generosity and universal generosity (from Olympic);
"Syd", a platypus, represents the environment and captures the vigor and energy of Australia and its people (from Sydney);
"Millie", an echidna, is a techno-whiz and information guru, with all the facts and figures at her fingertips (from Millennium). (source: link)