Major courier companies in China announced on Tuesday that they will have zero tolerance for trading in illegal wildlife and wildlife products.

Representatives of 17 courier enterprises, including China Post, SF Express and STO Express, signed a proposal in Beijing on the second World Wildlife Day, promising to refuse to handle orders of illegal wildlife and wildlife products, including ivory, rhino horn and tiger bone.

"We will ensure that our employees are more informed about endangered wildlife and related products. We will also enforce stricter checks before packing the goods, and report to authorities people we find transporting such goods without permission," the enterprises said.