Terri, Bindi and Robert Irwin

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To keep the memory of his father alive, Robert says he watches tapes of The Crocodile Hunter every day. "It's so good because it's like he's actually there, and he was the best dad ever," Robert says.

Terri says their loss is still hard. "I think living with Steve was like standing in a cyclone," she says. "It was 'Cyclone Steve' with that passion and enthusiasm, and [we were] just trying to keep up every day. Then when we lost him, it was just like the wind stopped."

Instead of shutting down after Steve's death, Terri says the family has kept his conservation efforts alive with The Steve Irwin Wildlife Reserve in Queensland's Cape York Peninsula. "Not only have we continued, we've just gotten bigger and better," she says.