Illegal hunting of animals is called poaching. Poachers hunt the animals for selling their skin, horn, fur and hides. All valuable parts of these animals are used for various purposes and are sold at very high prices.
Uses for ornaments : The bones and other parts like trunks of elephants etc. are used to make ornaments.
Uses in medicines : The horns and bones of some animals like rhinoceros and tigers are used to prepare some traditional medicine specially in Asian countries.
For wall hanging and clothings : The skin, fur and hides are used for the clothing and wall hangings.