Sir David Attenborough has said that he regrets missing out on seeing his children grow up. The 91-year-old naturalist told the Radio Times: "If I do have regrets, it is that... I was away for three months at a time. If you have a child of six or eight and you miss three months of his or her life, it's irreplaceable; you miss something."
He added that his wife Elizabeth, who died in 1997, was "understanding".
Britain's best loved broadcaster is no stranger to talking honestly - and he has a particularly strong record when it comes to women.
Here, are some of his best quotes...
1. When he talked honestly about loving his wife:
Attenborough's wife, Jane Elizabeth Ebsworth Oriel, collapsed with a brain haemorrhage, while he was filming in New Zealand. He flew home and found her in a coma, when a doctor suggested he hold her hand.
"She did, and gave my hand a squeeze", he wrote in his memoir Life on Air. Jane died soon after.
"The focus of my life, the anchor had gone... Now I was lost."
2. When he pushed for women's rights:
"You'll discover in countries where women have control over their own bodies, where they have education, where they have birth control, where they have facilities and where they are literate, when those things happen, the birth rate falls. Always. Always."
3. When he stuck up for his female bosses:
"The BBC in terms of women's employment has been far ahead. Every boss I had was a woman. It angers me when people think the BBC is male-dominated, it's not, and it never has been. The Madagascar series was almost entirely women, I think I was the only bloke there."
4. When he declared himself a feminist - despite refusing to use the word:
"I'm not a feminist. I'm a humanist. I'm neither one side nor the other. It's about the human being. And wanting human beings to be better off so they don't view children as an insurance for the future."
5. When he flirted with actress Jessica Chastain on the Graham Norton Show:
DA: "I'm there to explain what the male birds do to ingratiate themselves to the female birds.
'They hang upside down and whistle and they have long quills coming out of their tail which they flick across the face of the female."
Chastain: "That wouldn't impress me at all."
DA: "It would. I can show you later!"
6. When he advocated autonomy over fertility:
"The only acceptable way is if you can persuade people to have fewer children. In the Victorian times, there were families of 15 children. Someone like Edward Lear, he was the last of 21 children. And so what we have to think about is offering people the alternative choice. And in the West, that's what's happening. The birth rate has been dropping steadily and still is. But there is still a vast amount of the world where that's not the case. And that is where the big population growth is taking place."
7. When he made curling sexy and narrated the women's event at the 2014 Sochi Winter Olympics:
"Watch as the alpha female displays her dominance over the herd by tapping the head of the frisking broom to check for rogue insects. And off she goes, gently but flamboyantly launching the over-sized walnut down the frozen river. The alpha female's job is now complete. It's down to the herd to frantically follow the walnut down the river, gently frisking the foreground. The frisking is frantic and often futile, making no difference to the success of the net thrrrust. But it's playful, and all part of what makes this game the sliding curlers play so magical."
8. When he won the hearts of mums the world over:
"The one creature that really makes my jaw sag, that I find absolutely fascinating so much that I can hardly stop looking at it is a nine-month-old human baby."
9. When he revealed that he reads letters from young fans:
"I had a sweet letter from a girl who said she liked the programme. She ended the letter by saying 'I like animals because they are very different' and I thought, yeah, she's hit it on the head. That's exactly why I like animals, because they are different."