Hundreds marched through Johannesburg Saturday to call for the protection of rhinos and elephants, part of demonstrations for World Wildife Day in 136 cities around the world.

The march through Johannesburg's downtown was to press governments to end international wildlife trafficking. Africa's elephant and rhino populations have dwindled as the global demand for ivory has increased, especially in China and Vietnam where trade in ivory is legal.

Ahead of the march, activists delivered letters to embassies of these and other countries implicated in trafficking, demanding stricter laws against wildlife poaching.

The Johannesburg march also included a call to end captive lion hunting, while the Paris march called for the protection of tigers. Similar protests took place in Nairobi, where hundreds of Kenyans marched for increased protection of the country's wildlife.