Some twins like to play tricks on friends, family and teachers by swapping roles and seeing if anybody can figure out which one is which. That won't be an option for twin sisters Myla and Anaya Yarker.
Although the baby girls were born just two minutes apart, their colouring is nothing alike - one is dark with brown eyes like dad, the other is fair like mum.
Hannah Yarker, 20, said friends joked about the possibility of the girls having different skin colour when she was pregnant.
"Kyle is mixed-race and I'm white, so from the word go, our friends joked: 'What would you do if one came out dark and the other was fair?'," Ms Yarker told Daily Mail.
"Laughing it off, I replied 'I don't think it's very likely!' Now our girls turn heads wherever they go - and it's not just because they are so cute."
Ms Yarker, from Sale in the UK, said people often doubt the girls are even related, let alone twins.
"I can't walk down the aisle at the supermarket without getting stopped. People always comment: 'Are they both yours?', 'are they sisters?', 'are they related?'"
Anaya and Myla were born last April weighing 2.67kg and 2.86kg respectively.
The proud parents didn't notice the difference in their daughters' skin colour immediately, but after a while the difference became more obvious.
"At first, both the girls had a purple tone to their skin, but they looked darker so I assumed they'd both taken after Kyle," Ms Yarker said.
"But after two weeks, it was clear Myla takes after her dad with dark skin, brown eyes and brunette locks, while Anaya is more of a mummy's girl with a pale complexion, fair hair and light eyes."
"We couldn't believe it. Kyle and I told all of our relatives and friends: 'We've got one of each'."
Experts say the chance of a mixed race couple having twins with different skin colours is about 500 to 1.
As non-identical twins, Myla and Anaya grew in separate amniotic sacs and took different genes from each parent.
The parents say their daughters not only have different colouring, their personalities are also opposite to each other.
"As well as looking different, Anaya and Myla are already developing their own personalities," Ms Yarker said.
"Myla is always on the move - she's already crawling, although backwards, while Anaya's more laid-back.
"We can't believe they're twins - they've got the same birthday and the same mum and dad, but they're just complete opposites in every way."