Legendary Australian racehorse Black Caviar, who won the hearts of Australians with her unbeaten run of 25 victories, has passed away the day before her 18th birthday.

Trainer Peter Moody said in a statement. “She was a remarkable horse who gave us all the ride of a lifetime and wonderful memories” while the champion mare’s ownership group said: “Black Caviar was a once-in-a-lifetime horse, most famous for her stellar racing career which saw her undefeated with 25 wins from 25 starts.

“The ownership group are devastated, however will reflect on her glittering achievements not only in Australia where she transcended racing and captured the hearts of the public, but in England where she famously won the 2012 group 1 Diamond Jubilee Stakes (1200m) at Royal Ascot.”

Black Caviar was added to the Australian Racing Hall of Fame in 2013. Since racing retirement, she had enjoyed success as a broodmare, with her legacy to continue through her sons and daughters.

“Today’s news is a shock to us all,” Victoria Racing Club Chair Neil Wilson said in a statement. “Black Caviar was more than a champion racehorse, she was an important part of life for many people.

“Her brilliance, her presence and the pleasure and inspiration she gave to so many was a special moment in time for horse racing and sport more generally. She has created a piece of history that will be remembered forever, and it was a privilege for all who saw this wonderful equine athlete in action.

“The VRC was privileged to have Black Caviar race at Flemington and to have the Lightning Stakes named after her in 2013, a race she won three times including the first year it was named in her honour.

“Our heartfelt condolences go out to those close to her, including our friends in the ownership group. To Black Caviar’s trainer Peter Moody and jockey Luke Nolen, our thoughts are with you on this sad day.

“She was simply the best.”