Steve Irwin's son Robert has admitted it's "hard to celebrate" milestone birthdays while "missing" his late father on his 21st birthday.
The Australian conservationist marked his birthday on December 1 by sharing throwback pictures of the famous 'Crocodile Hunter' - who tragically died aged 44 in 2006 after being pierced in the chest by the barb of a short-tail stingray - when he turned 21 and vowed to continue honouring his legacy as he embarks on the next "chapter" of his life.
