from poachers. kristie lu stout has the story. reporter: this lush, tropical forest in northwest thailand is hiding a rare endangered species. it s one of the last gas chons for the indochinese tiger. poached to the brink of extinction for their fur and glus traditional medicine, this iconic species has all but disappeared from much of its range. almost everywhere, in fact, except for here. the wildlife sanctuary is part of thailand s western forest complex. with almost 7,000 square miles of protected jungle, it forms the largest in tact forest block in mainland southeast asia. fertile ground for tigers. and this woman is on their tail. this is the tiger track. i m dog the measurement to make sure this is real tiger tracks. i will say this is healthy one