ET's Rachel Smith exclusively spoke to Robert Irwin, where he had nothing but praise for his older sister, Bindi Irwin, as a mother. Bindi and her husband, Chandler Powell, welcomed their now 3-month-old daughter, Grace, back in March. Robert also opens up about what he learned from his late dad, Steve Irwin, and how he utilizes it in his everyday life. He also has an upcoming 'Shark Week' special, which airs July 11 on the Discovery Channel.

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