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Prince William gave a little bit away about his young son in a documentary due to be screened on Sunday.
The 31-year-old laughed off questions about Prince George's legacy and said:
"At the moment, the only legacy I want to pass on to him is to sleep more and maybe not to have to change his nappy quite so many times, but as he gets older I'm sure he'll pick up the bug of conservation."
Prince William has spoken to ITV and CNN of his lifelong love affair with Africa's natural world.
The new father's love of wildlife is reflected in his royal patronage of the UK-based African wildlife conservation charity Tusk Trust.
Fatherhood has made Prince William more determined to "stand up for what is very vulnerable and needs protecting".
The 31-year-old spoke of his affinity with wildlife during an informal chat filmed at Kensington Palace, which will be shown on ITV and CNN on Sunday and Monday respectively.
The birth of prince George has changed his father so profoundly that he has become more protective of endangered animals.
In an interview to be screened by ITV and CNN on Sunday and Monday respectively, Prince William talks about his passion for wildlife and how fatherhood has changed him.
William was left close to tears after being shown footage of a rhino attacked by poachers and left bleeding to death during filming for a documentary.
Documentary film maker Jane Treays writing in the latest edition of the Radio Times, said William became emotional when shown footage of the rhino "watching pictures of a butchered rhino bleeding to death. Tears well in his eyes and he confesses to everything being changed by the birth of his son."