Mark Kinver|Environment reporter|BBC News

Conservationists have launched a global campaign asking the public to help tackle the illegal trade in wildlife.

They have developed a smartphone app that allows people to submit images and data of suspicious items on sale, possibly helping enforcement agencies.

The United Nations estimates the illegal trade is worth billions of pounds each year.

Despite efforts to crack down on the slaughter, it continues to grow, say campaigners.

In recent years, there has been a resurgence in the poaching of threatened species, raising concern about the long-term survival of iconic animals such as tigers and rhinos.

Growing demand for protected animal body parts and products on the Chinese black market is widely viewed as one of the main drivers for the growth in the trade.