The exact method by which different animals are poached is given in the book "The Kaziranga Trail' which is written by Arup Dutta. Reading it will make you succumb to tears, as the way by which the animals are killed by the cold-blooded poachers is incredibly ruthless.
One of the world's most active organization in saving wildlife and endangered species and climate change etc is the WWF. The original expansion of WWF when it was founded in 1961 was World Wildlife Fund. But as the organization grew and became famous, its expansion changed though its initials remain the same. The new expansion for WWF is- "World Wide Fund for Nature" (except in North America where the old name is retained). The main aims and policies of the WWF are to share our world with the other species living in it too, as not only humans have the living right but that other species have it too. It promotes awareness by highlighting the point that- we humans should not be the cause of their extinction and that we also should learn to live comfortably with the resources available to us without wasting scarce ones. Yes, this is the aim of all other environmental organizations all around the world too.
The wildlife can be conserved from extinction and further endangerment by perpetuation (Artificial Breeding of species by setting artificial habitat and living conditions.) of rare species of plants and animals. Wildlife can be preserved and saved from extinction by building sanctuaries, national parks, biosphere reserves etc. An animal sanctuary is a facility where animals are brought to live and be protected for the rest of their lives. It is protected area where no tribes or unauthorized people or people without permission to visit the sanctuary are allowed. A national park is a protected area where no humans or tribals are allowed without authorization of forest department. Visitors must be accompanied by forest officials if they want to look around. Researchers may conduct research without killing of any animal and are allowed in ONLY with permission. A biosphere reserve is a very large stretch of highly guarded area, which is divided into 3 regions or zones--- The Core zone, The Buffer zone and The Outer zone. NOBODY is allowed in the Core zone not even forest officials or researches. It is a very pristine area, just resembling a forest. As a matter-of-fact, it IS a forest. In the buffer zone only researchers and forest officials are allowed and the visitors are allowed with permission. Whereas in the outer zone, the tribals are allowed to live and cultivate their land. Deforestation is strictly prohibited.