No picture was submitted of the tree damage.
A. This is probably sapsucker damage. They are in the family of woodpeckers.They are migratory in the Las Vegas Valley and probably overwinter mostly in northern Mexico. So you see this kind of damage on preferred trees twice a year.
|Sapsucker damage on Tipu.|
|Sapsucker damage to Southern Live Oak|
|Sapsucker damage to blue ghost eucalyptus|
For more information and some suggested control measures visit my blog at these locations.