The Duke of Cambridge and Prince Harry have reportedly gone hunting in Spain - a day before William and his father, the Prince of Wales, call on the world to combat the illegal wildlife trade.
The royal brothers are set to hunt wild boar and stags on a private estate, according to The Sun.
In a video message due to be broadcast tomorrow, Charles and William will call on people to act now to save endangered animals like rhinos, elephants and tigers.
A royal spokesman told ITV News they would "never" confirm what the princes do in their private time. He added:
"The Duke of Cambridge has for many years been a passionate advocate for endangered wildlife and has campaigned tirelessly to help stop the illegal poaching of rhino horn and elephant tusk. His track record in this area speaks for itself."
Hong Kong is acting as the gateway for illegal ivory entering China - where the item is high in demand.
Prince Charles and Prince William joined launched a campaign to save endangered species like rhinos, tigers and elephants from poachers.