They survived almost four decades after the program ended, thanks to the perseverance of the program's last coordinator, Chan Robbins, a retired wildlife biologist.

CNN: Ninety years of birdwatchers' notes going online

Undurraga is particularly concerned about the NARMS findings because it means the consumption of meat is adding to what the director-general of the World Health Organization, Dr. Margaret Chan, last year called a "post-antibiotic era" in which antibiotics will no longer work to fight disease because too many bacteria have developed resistance to it.

CNN: What government tests found in your meat

Undurraga is particularly concerned about the NARMS findings because it means the consumption of meat is adding to what the director of the World Health Organization, Dr. Margaret Chan, last year called a "post-antibiotic era, " or an era in which antibiotics will no longer work to fight disease because too many bacteria have developed resistance to it.

CNN: What government tests found in your meat

"Over the last couple of years, there has definitely been an upswing, " said Deborah Chan, programme manager of Wild Asia, a Malaysia-based NGO dedicated to promoting responsible tourism throughout Asia.

BBC: Sustainable travel in Malaysia