Last winter in Arizona/Tucson there were several days of freezing weather, 19 degrees F. Some of the tall old Saguaros suffered a lot of damage and are in the process of dying.
I decided to sketch a study of the damage.
First the summer fruit production is drastically reduced. Then the outer shell starts peeling away, the arms fall off or leave remnants of the inner structure. The inner ribs are bare sticks. The holes that the birds make for nests create a 'boot' inside the cactus and when the outer cactus layers peel away the boot is left hanging.
So sad to see these old giants dying but that is part of life and death in the desert.