The arrival of Prince George has irrevocably changed his father, and he now feels deeply protective of endangered animals. In a new ITV documentary, the second in line to the throne explains how the birth of his son has changed him.
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.
Africa, emotionally and mentally, has affected me. It's magical...This is a lifelong commitment and I'll always be involved ... no matter what.
I love the fact you can go into any village in Kenya or the east coast of Africa and just walk in and have a chat with someone and they have absolutely no idea who you are. Usually my Swahili stops after about two sentences but we muddle through in English.
I've got hundreds of animals on my iPhone, noises and sounds of the bush, so if I'm having a stressful day, I'll put a buffalo, a cricket or a newt on and it takes you back instantly to the bush.
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 wildlife is incredibly vulnerable and I feel a real protective instinct, more so now that I am a father, which is why I get emotional about it... you want to stand up for what is very vulnerable and needs protecting.
Elephants, rhinos and many other animals that are persecuted don't have a voice...
It's just so powerful. You'd think something that big and that's been around so long, would have worked out a way to avoid being caught and persecuted, but they really don't. I do feel anger, but I also feel really great hope that we will overcome this as a human race.