[custom_adv] Each year, hundreds of millions of plants and animals are caught or harvested from the wild and then sold as food, pets, ornamental plants, leather, tourist curios, and medicine. [custom_adv] While a great deal of this trade is legal and is not harming wild populations, a worryingly large proportion is illegal — and threatens the survival of many endangered species. [custom_adv] With overexploitation being the second-largest direct threat to many species after habitat loss, WWF addresses illegal and unsustainable wildlife trade as a priority issue. [custom_adv] Whenever people sell or exchange wild animal and plant resources, this is wildlife trade. It can involve live animals and plants or all kinds of wild animal and plant products. [custom_adv] Wildlife trade is easiest to track when it is from one country to another because it must be checked, and often recorded, at Customs checkpoints. [custom_adv] The trade involves hundreds of millions of wild plants and animals from tens of thousands of species. To provide a glimpse of the scale of wildlife trafficking, there are records of over 100 million tonnes of fish, 1.5 million live birds and 440,000 tonnes of medicinal plants in trade in just one year. [custom_adv] Wildlife trade is by no means always a problem and most wildlife trade is legal. However, it has the potential to be very damaging. [custom_adv] Populations of species on earth declined by an average 40% between 1970 and 2000 - and the second-biggest direct threat to species survival, after habitat destruction, is wildlife trade. [custom_adv] Recent overexploitation of wildlife for trade has affected countless species. This has been well-publicized in the cases of tigers, rhinoceroses, elephants and others, but many other species are affected. [custom_adv] Wildlife is vital to the lives of a high proportion of the world's population, often the poorest. Some rural households depend on local wild animals for their meat protein and on local trees for fuel, and both wild animals and plants provide components of traditional medicines used by the majority of people in the world. [custom_adv] While many people in developed countries are cushioned from any effects caused by a reduced supply of a particular household item, many people in the developing world depend entirely on the continued availability of local wildlife resources. [custom_adv] In addition to the impact on human livelihoods caused by the over-harvesting of animals and plants is the harm caused by overexploitation of species to the living planet in a wider way.