Pack Mule Train
We saw many more mule trains waling on the Bright Angel trail. These mules move fast, the basic rule is for the entire group to move to one side (the same side) and do what the wrangler directs you to do.
A mule is the offspring of a male donkey and a female horse.
Equus asinus x Equus caballus
Mules exhibit a higher cognitive intelligence than their parent species. This is believed to be the result of hybrid vigour, similar to how mules acquire greater height and endurance than either parent.
Seen while walking to Indian Garden, Grand Canyon National Park