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. 2020 Feb 13;15(2):e0228991. doi: 10.1371/journal.pone.0228991

Table 2. Physiognomic features used to distinguish polar bears.

Features Categories
1) Posture/build Massive, heavy, slender
2) Head shape Broad, slender, pointed
3) Body condition Scale of 5 (skinny to fat, Stirling et al. [35])
4) Belly size Scale of 3 (flat to bulging)
5) Teeth (in particular canines) Damaged or not
6) Hair pattern on top of head and muzzle Shape of strands
7) Hair coverage of outer ear Fully covered or not
8) “Beard” Present or not
9) Throat fold Present or not
10) Pattern of dark patches on muzzle
11) Pattern of scars or wounds on head
12) Pattern of scars or wounds elsewhere
13) Any other identifying features