Prince Charles and Prince William have launched a campaign to end to the illegal trade in elephant tusks and rhino horns.
In a video appeal they say that poaching has reached an all time high, putting the animals at risk of extinction.
They say that nearly 100 elephants are killed every day, a rhinoceros is killed every 11 hours and a wild tiger population which a century ago was around 100,000 has now been reduced to an estimated 3,200.
Prince William has also attracted criticism this weekend after he was reported to be hunting deer and wild boar in Spain. But Glyn Davies, from the World Wide Fund for Nature, said that the two issues were unconnected.