I think which for protect animals in extinct, is need look what is the origin of the problem, for then solve.
The animals which more need the protection are the more in extic,it's the most brittle in general terms, It's don't have enough and adequate care court the predators of this animals in extinct. The Ibama is the organ which care of the animals including the animals in extinct in my country, one of animals which in extinct in Brasil is the Arara-azul.