Endangered species, including tiger body parts, shark fins and pangolin scales, are being offered for sale on Facebook, BBC News has found.
One Chinese user posted videos of a tiger in a cage that was for sale as well as pictures of tiger bones and teeth, while another included two live tiger cubs in a box.
An image showed a tiger head and bones for sale piled up on scales.
A seller told the BBC his products “can be shipped to the UK”.
He said a 10cm-long tooth would cost 2,000 Chines yuan (about £213) and that he could sell me tiger bones for 3,600 yuan per kilo (about £380).
Another seller, who was offering shark fins, claimed to ship from the US to the UK and charged $50 per kilo (about £37).
The sale of endangered species such as tigers and pangolin is illegal in the UK and CITES, the Convention on International Trade in Endangered Species of Wild Fauna and Flora, closely regulates international trade in species under threat.
The voluntary agreement, signed by more than 180 countries and other bodies, only allows the trade if it is both legal and sustainable.