Robert Irwin left in tears after receiving birthday message from late dad Steve

Steve Irwin's son Robert Irwin was left in tears after receiving a birthday message from his late father.

Robert was just three when his dad sadly passed away after being injured by a stingray in 2006. He was aged just 44.

Now, in heartwarming footage, Steve can be seen discussing his son's birth - and it's an emotional watch for Robert.

You can see the clip below:

In the clip, Steve can be heard saying: "I'm in the hospital and Terri's pushing and pushing and it's hard.

"And anyway, bang, pop him out, and I've lifted him up and you know he's a little bloke, and put him on Terri's chest and we're just stoked.

"And at that moment, at that very moment I saw the light. The whole time you're here you know I'm catching crocs saving wildlife, doing this, doing that.

"I had the same sensation when Bindi was born, I had the same sensation now with little Bob, it's like, this is why I was put here, because I could be dead tomorrow.

"So I need these blokes to like come up as quick as they can, so this little bloke's gonna have to catch the crocs with Bindi."

YouTube/DisKirra

After the touching video ends, Robert says: "Making me cry on my birthday."

"It means the absolute world," he continued. "I just think it's such a privilege, personally and as a family, to continue the legacy of dad.

"He gave his life, quite literally, for wildlife conservation and to make the world a better place."

He added: "I just hope he'd be proud and I hope I can find my own way and continue a legacy that is so profound."

AFF/Alamy Stock Photo

And social media users were blown away by the video, with many emotional over the clip.

One person wrote: "This world has truly not been the same since Steve parted with us... it’s so amazing to see him still inspiring people on wildlife awareness through his family, I’m sure he’s so proud of you all!"

While another said: "Your Dad was such a cool awesome guy. So, so passionate about his work. Your Mom, wow, she has done such an amazing job raising you and your sister in the face of what no doubt had to be some difficult times for her. Just incredible. Happy birthday, Robert!!!"

And a third added: "All these years later, still not over Steve's death. What an impact he has made on the world. Robert is clearly following in his dad's gigantic footsteps."