The estimated value of the market for wildlife tracking is at least €10bn, making it one of the largest illegal trades in the world.
Many people would probably claim to be outraged by this, but where does one draw the line? If you are against wildlife hunting, should you also be against animal experimentation, or eating meat?
A small but growing minority of people is choosing to become vegetarian or vegan.
There are a growing number of animal sanctuaries, from the very well-known, through to much more recently established bodies.
Some organisations also campaign against not just against meat, but also against all human uses of animal products.
In some parts of the world, including whole districts of some major Indian cities, meat-eating is becoming a social stigma.
There are also powerful advocates on both sides of the animal experimentation debate, which is becoming ever more divisive, with e.g. some animal rights groups targeting research organisations or private investors.