Teachers will be seeing double this week as 15 sets of twins start school in just one region in Scotland.
In the area of Inverclyde, which has a population of just over 82,000, there must be something in the water, as the twins joining local school rolls this year brings the total to 80 sets of twins in primary schools across the region.
And while 15 may sound like a record number, last year saw 19 pairs enrolled in the area.
In what's become a local tradition, each year's newly enrolled twins are brought together for a photograph ahead of their first school term.
Terry Loughran, convener of education at Inverclyde Council, told the Daily Mail: "We seem to have an ever-increasing number of twins starting school, although it has scaled back slightly this year.
"It's a really exciting time for them, and for parents too, although it can occasionally provide a challenge for teachers identifying who's who as traditionally we would have the twins in the same class."
Sara Goyal is mother to five-year-old twins Charlotte and Morgan. She says the pair are "very excited" to start school.
"They will be in the same class. They asked my opinion and although they get on very well they aren't so close that I thought it would be a problem for them to be taught together."
Goyal told the Daily Mail how interesting it was to see all the different personalities at the photo shoot.
"With my own twins, one is exuberant and one is quite quiet, and it seems to be the same with the others."