Prince William has labelled the illegal poaching of wild animals "economic sabotage" and warned that elephants, rhinos and tigers could "end up like the dodo" unless it is stopped.
He joined his father in co-hosting the wildlife conference with Environment Secretary Owen Paterson at St James's Palace.
Prince Charles earlier issued an impassioned plea, saying the fight against poaching was a "terrible race against time".
Mr Paterson warned that poaching was funding terrorism and other criminal activities and said "failure would be a shame on us all".
More top news
Two million customers on smart meters will benefit from free energy between 9am and 5pm on weekends.
How are the regions commemorated the soldiers killed in the Battle of the Somme?
Mosha had part of her leg blown off by a landmine on the Myanmar-Thailand border when she was seven months old.