sumidero canyon vulture, mexico

america avian beak bird birds black canyon chemical chiapas cliff climb dirt disaster eagle earth ecological edge endangered eroding erosion feathers fierce filth flight formation formations garbage geological geology gorge grand grijalva hazard health hike hiking landmark landscape national natural nature outdoor outdoors park polluted pollution predator ravine red reserve river rock rocky sand sandstone scavenger scavengers scenery scenic stone tourism tourist travel traveling vacation valley vulture vultures waste wastes wild wings