The Crocodile Hunter would have turned 60 on Tuesday, February 22. He sadly lost his life at the age of 44 in 2006 after he was pierced in the chest by a stingray barb.
In the snap, the then-youngster stood next to her dad while he held up a small snake. "Happy Birthday to the greatest dad and Wildlife Warrior," she captioned the post. "Today I’ll watch The Crocodile Hunter with Grace Warrior and share stories about her incredible Grandpa Crocodile. I love you with all my heart. Your legacy lives on."
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Robert also posted a photo to his Instagram page of him sitting on a motorbike with his father. "Happy birthday Dad. I love you and I miss you more every single day," he wrote. "My earliest memories are my fondest, thanks to you."
"Hanging on tight to the handlebars of the motorbike, when you’d take Bindi and I on your morning lap of the zoo — before going to get ice cream for breakfast," he recalled. "Every minute spent with you was a blessing. I’m gonna ride that lap on your old motorbike this afternoon."
Bindi previously paid tribute to both her dad and her husband's family by naming their little girl after her "great-grandmother, and relatives in Chandler’s family dating back to the 1700s." Meanwhile, her "middle names, Warrior Irwin, are a tribute to my dad and his legacy as the most incredible Wildlife Warrior."
An OK! insider recently revealed Bindi and Chandler are hoping to expand their family and offer fans a glimpse into their extraordinary lives at the zoo. "They would love to put down roots [in the States] before having another child," the source spilled of their future plans. "They’ve been taking meetings with Hollywood producers for a range of projects, including a new reality show and a wildlife documentary."