Steve Irwin's two children Bindi and Robert Irwin have left touching tributes to their father on what would have been his 56th birthday.
Both the Irwin children took to Instagram on February 22 to wish their late dad a happy birthday.
Robert, 14, shared an adorable photo of his young self with his late father both posing with a thumbs up to the camera.
His caption to the photo was even more moving.
"Thinking of my dad today," Robert wrote. "To so many people he was the Crocodile Hunter, but to me, he was the best dad in the world."
Bindi also shared a sweet photo of her dad and her grandma, Steve's mother Lyn Irwin, whose birthday was also on the same day.
"Happy Birthday to my dad and grandmother," she wrote. "I wish so much that I could give you birthday hugs. You are both in my heart today and I hope you are celebrating together."
Just a few weeks ago, the 19-year-old shared a touching video of Steve talking about his two children.
Bindi shared footage she had never seen before of her late dad emotionally talking about his 'ultimate goal'.
"Is there anything in this world that would want to make me give away what I'm doing now?" Steve says in the clip.
"Yes, there is. When my children can take the football that I call wildlife conservation and run it up. When they're ready to run up our mission, I will gladly step aside.
"And I guarantee you it will be the proudest moment of my life," the late Crocodile Hunter said holding back his tears.
"My job will be done. Then, and only then, will I know that I have achieved my ultimate goal. To be able to stand aside and let them run up my mission."
Steve tragically passed away at 44-years-old in 2006, after being stung by a stingray while filming a documentary in Queensland.
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