While timothy hay has long been a staple for small herbivores, some companies also offer different types of grass hay, such as orchard grass hay. (petbusiness.com)
Chinchillas require a high fiber diet and should be offered grass hay (such as Timothy hay or other low calcium hays such as orchard grass, oat hay, or meadow hay) free choice (available 24 hours a day). (cedarbayouanimalclinic.com)
Other types of grass hays include orchard grass, oat and brome. (petbusiness.com)