Prince Charles and Prince William have recorded a video in six different languages to save endangered animals.
The princes turn their hands to Vietnamese, Mandarin and Arabic during the clip, urging the world to end the illegal wildlife trade.
Their joint appeal came the day after William went on a wild boar and deer hunting trip in Spain, The Sun revealed (£).
He was reportedly joined on the trip by Prince Harry, although there was no suggestion their hunting was illegal.
The father and son's joint plea comes at the start of a week of wildlife conservation activities, which will culminate in them attending the London conference on the Illegal Wildlife Trade.
The video ends with Charles saying the phrase "Let's unite for wildlife" in Arabic, Spanish and Mandarin while William says the same words in Vietnamese and Swahili.
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The Prince, president of WWF-UK, begins the message by stating: "We have come together, as father and son, to lend our voices to the growing global effort to combat the illegal wildlife trade - a trade that has reached such unprecedented levels of killing and related violence that it now poses a grave threat not only to the survival of some of the world's most treasured species, but also to economic and political stability in many areas around the world."
William is royal patron of the wildlife conservation charity Tusk Trust, and last year formed the umbrella body United for Wildlife to help tackle the threat to the world's endangered species.
He said: "This year, I have become even more devoted to protecting the resources of the Earth for not only my own son but also the other children of his generation to enjoy.
"I want them to be able to experience the same Africa that I did as a child."
His father highlight how "organised bands of criminals" are feeding an insatiable demand for animal products much of it destined for consumers in Asia.
Spelling out the cost in animal lives, Charles said: "More than 30,000 elephants were killed last year amounting to nearly 100 deaths per day.
"In the past ten years, 62% of African forest elephants have been lost. If this rate continues, the forest elephant will be extinct within ten years. A rhinoceros is killed every 11 hours.
"As recently as 100 years ago, there were as many as 100,000 wild tigers living in Asia. Today, there are believed to be fewer than 3,200 left in the wild."
The father and son sit side by side in their message recorded at Clarence House in November, and the video features images of the carcasses of animals killed by poachers but also others running free on grass plains and Charles and Camilla in Africa.