Bears are Not Subtle
pincer marks rend open tree bark , oozing sap like a botanical blood . Scratches like this shrieking a single message meretricious and readable : a bear was here . They are n’t subtle creature . As part of efforts to track bear without trapping them , US Geological Survey scientists find places frequented by bears to congeal up non - invasive hair traps . By analyzing hair , the researchers can track bears and learn about their diet and genetic science without interpose with them ....