Kate Middleton and Prince William
Kate Middleton won't join Prince William royal trip to Africa. Pictured: Middleton and Prince William attend the Men's Singles final on day thirteen of the Wimbledon Lawn Tennis Championships at All England Lawn Tennis and Croquet Club on July 15, 2018 in London. Getty Images/Clive Brunskill

Kate Middleton will not be joining Prince William on his upcoming trip to Africa.

The Duke and Duchess of Cambridge often attend royal engagements together. However, Middleton will not accompany her husband when Prince William flies to Africa as part of his role as the President of United for Wildlife and Tusk Trust.

According to OK!s royal expert Christina Reeves, the couple usually opts to go alone when it comes to their solo projects. Prince William prefers to go alone for his campaign against wildlife trade. Middleton also does the same for projects close to her own heart.

"Typically William has always worked solo in his fight against illegal wildlife trade, which is why we wouldn't see Kate join him on a trip like this or him joining Kate on her own personal projects, such as promoting the importance of perinatal, maternal and children's mental health," Reeves explained. "William's visit to Africa is in the same vein as his 2016 solo trip to Vietnam, where his goal was to urge people to stop buying rhino horn and elephant ivory."

Prince William's trip to Africa was arranged by the UK government. The Duke of Cambridge will have some public engagements, but the majority of his schedule will remain private.

Middleton's husband is set to meet the leaders from different countries and other key figures as they work together in animal conservation ahead of October's Illegal Wildlife Trade conference in London.

It's not new for Prince William and Middleton to do royal duties on their own. In fact, the Duchess of Cambridge visited Luxembourg last year without Prince William.

Middleton's flew there for the 1987 Treaty of London to mark the 150th anniversary of the country's independence. In 2016, Middleton also visited the Netherlands alone.

In related news, Prince William just revealed Princes George's new obsession. According to the royal dad of three, his eldest is into dinosaurs. According to 5-year-old's new interest is common among kids his age. When children are between 2 and 6 years old, they began to develop an interest in new things and among these are vehicles which include trains, airplanes and cars, and dinosaurs.

Prince William also believed that he would be the most popular dad in the country after visiting the University of Birmingham because he received special presents for his kids which include coloring books that feature dinosaurs and fossils, whales and more. The duke was sure that his children would love it.