Mammals, are using the roads at the Yellowstone National Park as a form of defense against predators.
Researchers noticed that some mammals seem to be attracted to the roads as a shield against predators.
Moose are a telling example of this. Pregnant moose move an average of 122 metres closer to roads each year of their birthing period, bringing them from 1,000 metres to 380 metres of the road; because their calves are heavily predated on by bears.
As of now the bears keep away from roads. Maybe, these bears are wary of humans, but it will not be long before they overcome their wariness.
Moose use roads as a defence against bears