The odds of having a set of twins (without the use of fertility drugs) is about 1.5 percent (1.5 births per 100), according to Twins UK. The odds of having non-identical twins: about "one in a million," according to Daily Mail

One couple defied both odds. Rebecca  Horton, 28 and Curtis Martin 24, had twin girls in April. But these twins are even more unique because they have different skin colors, according to Daily Mail. 

Kendall has white skin, Baylee has black. The genetic-rarity can occur when a mixed-race couple conceives, such as in the case of Rebecca and Curtis. Horton is white while Martin is half Jamaican, according to the Daily Mail. 

"When they were born, we just kept staring at both of them- we couldn't believe it. One thing I know for sure is that family and friends won't ever struggle to tell them apart," Rebecca said, according to Daily Mail.

As the girls have aged, Martin said they frequently surprise people when they tell them the girls are twins. 

"We've got used to it, but you hear people whisper as we walk past," Martin said, according to the Daily Mail. 

Their looks are a result of the DNA mixing in different ways while they were in the womb, and doctors say that as they grow older and their skin tone and hair tones adjust they could look more alike, according to The Sun.