Although relatively uncommon, a small number of mammals aestivate. Penile fracture is a relatively uncommon clinical condition. Other triphthongs such as and occur sporadically in interjections and uncommon words. Although very uncommon, a triple sharp () can sometimes be found. Vaccination rates have been high enough to make measles relatively uncommon. However, voiced affricates other than are relatively uncommon. Although very uncommon, a triple flat () can sometimes be found. Short pangrams in English are more difficult to devise and tend to use uncommon words. This is a relatively uncommon configuration. It is also home to a number of ethnic restaurants relatively uncommon in surrounding communities. DX communication is communication over large or relatively uncommon distances. Many earwig species display maternal care, which is uncommon among insects. Experimental medicine and some types of uncommon diagnostic or surgical procedures are considered quaternary care. The Doctor exhibits some weaknesses uncommon to humans. Eyelashes are an uncommon but not unknown feature in birds.