Grand Canyon Mules (and a raven)

These are not horses, they are the mules that people ride down into the Canyon (I would like to do this sometime, but it costs about $600 and you need to reserve in advance). The mules were sort of grumpy, but I petted one anyway. Later I found out I probably should not have, as they sometimes bite. But none bit me. A male mule is a "john" and a female mule is a "mollie".