The private sector promises to help end ivory poaching and other illegal activities.
The leaders of 30 transportation companies have made 11 key commitments to help tackle the illegal trade in wildlife products.
Signatories to the declaration include the parcel delivery service DHL, airlines such as Emirates, Etihad Airways and Qantas, the shipping group Maersk and industry bodies such as the International Air Transport Association.
The declaration was facilitated by United for Wildlife, the organisation set up by the Duke of Cambridge to fight the illegal wildlife trade, with a particular focus on elephant and rhino poaching and the trade in both live pangolins and their scales.
“This is truly an international response to the trafficking crisis,” said Stephen Broad, executive director of the trade-monitoring group Traffic.
But Prince William was criticised in some quarters at the time of the announcement for defending trophy hunting as a means of protecting some species in Africa.
Read the declaration