Note: Animal Orphanage of Denver CO seems to have let this domain (web site name) expire. Not sure if they're still around. Here are other links that may be of interest:

Mile Hi Humane - List of shelters in the greater Denver area
PetFinder.com - Adopt a homeless pet
WildAnimalOrphanage.org - Nonprofit sanctuary for nonreleasable wild animals
Google search for "animal orphanage"