We kill them for financial gain: one gram of powdered rhinoceros horn costs more than a gram of platinum and a single tiger can earn up to $ 300,000. There is no indication, in near future, of lack of demand for ivory, crocodile leather handbags, rhino horns - whose populations has decreased in 97%, or other live or stuffed animals - with the biggest threat comming from tourists . We can only, one day, run out of these animals.