“The true scale of the slaughter of pangolins in Africa has been revealed by new research showing that millions of the scaly mammals are being hunted and killed.
Pangolins were already known to be the world’s most trafficked wild mammal, with at least a million being traded in the last decade to supply the demand for its meat and scales in Asian markets.” https://www.theguardian.com/environment/2017/jul/20/scale-of-pangolin-slaughter-revealed-millions-hunted-in-central-africa-alone
Large scale poaching.
“Habitat loss and illegal hunting are leading drivers behind mammal population decline and extinction in the tropical forests of Southeast Asia. But what’s driving these drivers? Road infrastructure.” (http://news.mongabay.com/2015/0320-gfrn-mark-southeast-asia-roads-devastating-wildlife.html)
It’s clear that roads drive drivers, especially loss leading drivers, and illegal hunters are leading drivers behind mammal lines.