Muzzle length and heat loss.
Jablonski
N G
NG
D000818:Animals; D005075:Biological Evolution; D001833:Body Temperature Regulation / Q000502:physiology*; D009297:Nasal Mucosa / Q000098:blood supply / Q000502:physiology*; D009666:Nose / Q000502:physiology; D010215:Papio / Q000502:physiology*