Rocky Mountains National Park

Search efforts are in their fourth day as rescuers look for clues of the missing runner

The visitors are standing far too close and underestimate the bull's ability to clear a two-bar fence

Sometimes an elk calf might seem to be alone, but its mother is usually close by

The man's vehicle went over the side of Trail Ridge Road at Rocky Mountain National Park

Rutting season is just beginning, and bull elk are likely to be more unpredictable and aggressive than usual

Plan for wolf reintroduction in Colorado suggests bringing a breeding pair into the park