One Direction's Liam Payne and Niall Horan have admitted "cow poo" reminds them of home

When asked what smell reminds them of home, Niall, 20, told Cosmopolitan magazine: "Cow poo."

Liam, 21, agreed: "I was going to say the same. We both live close to the countryside. Where I live there are farms and you can always smell..."

Niall added: "I'm from the lake district of Ireland so there's the smell of cows and sheep and fresh-cut grass."

Meanwhile, the hunky boy band - who shot to fame after appearing on 'The X Factor' in 2010 - believe they've developed a strong bond, which extends further than just friendship, over the past three years.

Louis, 22, said previously: "I think 'family' is probably the best way of describing us. It's different to friendship."

Niall added: "Yeah, we spend a good time on the road, and, obviously it's so important that we all get along or it won't work."

Harry explained: "There could have easily been one person who didn't get along with anyone; who nobody liked, but it wasn't like that.

"The relationship that's grown with these four boys that I didn't even know three years ago is absolutely insane and it's incredible. I'm very lucky that I get to spend so much time with them."