Chitwan National Park, at the foot of the Himalayas in Nepal, is famous for its tigers. Credit: Center for Systems Integration and Sustainability, Michigan State University

Michigan State University PhD student Neil Carter readies equipment for field work to study human tiger interaction. Credit: Center for Systems Integration and Sustainability, Michigan State University

Crossing into Chitwan National Park, the first National Park of Nepal and a UNESCO World Heritage site. Credit: Center for Systems Integration and Sustainability, Michigan State University

Researchers check out trails for locations to install motion-detecting camera traps. Credit: Center for Systems Integration and Sustainability, Michigan State University

Neil Carter straps cameras on trees along footpaths and narrow roads inside and outside the park . Credit: Center for Systems Integration and Sustainability, Michigan State University

Each camera trap uses two cameras to capture both sides of a tiger, as each cat's stripes are unique and are used to identify them. Credit: Center for Systems Integration and Sustainability, Michigan State University

While tigers roam at all times of day, most tigers in study area had switched to hunting, mating and monitoring their territory at night. Credit: Center for Systems Integration and Sustainability, Michigan State University

Typically shy, tigers stay away from humans by choice. Credit: Center for Systems Integration and Sustainability, Michigan State University

A tiger’s eyes glow during the night on the same foot paths and roads that humans use during the day to collect wood and grasses. Credit: Center for Systems Integration and Sustainability, Michigan State University.

A pair of tigers rest safely at night on a trail that is patrolled during the day to guard against poaching . Credit: Center for Systems Integration and Sustainability, Michigan State University.