Editing Philippine tarsier (section)

== Anatomy and morphology ==

The Philippine tarsier measures {{convert|85|to|160|mm|in|2|abbr=on}} in height, making it one of the smallest [[primate]]s. The small size makes it difficult to spot. The mass for males is between {{convert|80|-|160|g|abbr=on|oz}}, usually lighter for females, somewhat heavier than other tarsiers such as the [[pygmy tarsier]].<ref>{{cite web | author = Gron KJ | date = July 22, 2008 | work = Primate Factsheets | url = http://pin.primate.wisc.edu/factsheets/entry/tarsier | title= Tarsier (''Tarsius'') Taxonomy, Morphology, & Ecology | access-date = August 23, 2009}}</ref> The average adult is about the size of an adult human fist.

The female tarsier has multiple sets of breasts, but the only functional set is at the pectoralis.<ref>{{cite web|last=Hellingman|first=Jeroen|title=The Philippine Tarsier|url=http://www.bohol.ph/article15.html|publisher=Bohol Philippines|access-date=March 3, 2014}}</ref> The other breasts are used as anchor points for the newborn tarsiers. The gestation period lasts 180 days, or 6 months, after which only one tarsier is born. The newborn tarsier is born with much fur and eyes open. Its body and head length is about {{convert|70|mm|abbr=on}}, and its tail is around {{convert|115|mm|abbr=on}} long.

Like all tarsiers, the Philippine tarsier's eyes are fixed in its skull; they cannot move in their sockets. Instead, a special adaptation in the neck allows its round head to be rotated 180°. Their eyes are disproportionately large, having the largest eye-to-body weight ratio of all mammals.<ref>arkive.org [http://www.arkive.org/philippine-tarsier/tarsius-syrichta/info.html species profile] {{Webarchive|url=https://web.archive.org/web/20090903200449/http://www.arkive.org/philippine-tarsier/tarsius-syrichta/info.html |date=September 3, 2009 }}</ref> These huge eyes provide this nocturnal animal with excellent night vision.<ref name="guide">{{cite web | url = http://www.philippines-travel-guide.com/philippine-tarsier.html | title = Philippine tarsier | work =  Philippines Travel Guide | access-date = November 14, 2006}}</ref> In bright light, the tarsier's eyes can constrict until the pupil appears to be only a thin spot. In low light or darkness, the pupil can dilate and fill up almost the entire eye.<ref name="suicide">{{cite news|title=Philippine tarsier known to commit violence|newspaper=Philippine Inquirer|date=May 23, 1999}}</ref> The large membranous ears are mobile,<ref name="tripod">{{cite web | author = Flannery, S | date = October 15, 2003 |  url = http://members.tripod.com/uakari/tarsius_syrichta.html | title = Philippine tarsier | work =  The Primata | access-date = November 14, 2006}}</ref> appearing to be almost constantly moving, allowing the tarsier to hear any movement.

[[Image:Angrytarsier.jpg|left|thumb|Philippine tarsier, showing lower jaw [[dentition]]]]
The Philippine tarsier has thin, rough fur which is colored gray to dark brown. The narrow tail, usually used for balance, is bald except for a tuft of hair at the end, and is about twice the body length. Its elongated "tarsus", or ankle bone, which gives the tarsier its name, allows it to jump at least {{convert|3|m|abbr=on}} from tree to tree.<ref name="guide"/> Its long digits are tipped with rounded pads that allow ''C. syrichta'' to cling easily to trees and to grip almost any surface. The thumb is not truly opposable, but the first toe is. All of the digits have flattened nails, except for the second and third toes, which have sharp claws specialized for grooming.<ref>{{cite web | url = http://www.brainmuseum.org/Specimens/primates/tarsier/index.html | title = The Philippine tarsier | work =  Comparative Mammalian Brain Collections, brainmuseum.org | access-date = November 18, 2006}}</ref>

Their [[Dentition|dental formula]] is {{DentalFormula|upper=2:1:3:3|lower=1:1:3:3}}, with relatively small upper canines.<ref name="tripod"/>