Convention on the International Trade of Endangered Species
It is an international legislation about trade between nation
species and habitats of species or resources are categorised into appendices - what can be traded or not
Appendix 1 - endangered species which cannot be traded at all
Appendix 2 - threatened species can only be traded if the importer and exporter has a permit
Appendix 3 - vulnerable species can be traded unless the country it is coming from says it can't. This is country dependant. This would happen if the species is endangered in the country but not globally.