Editing Harp seal (section)

====Senses====
The harp seal's eyes are large for its body size and contain a large [[spherical]] lens that improves focusing ability. Its mobile [[pupil]] helps it adapt to the intense [[Glare (vision)|glare]] of the Arctic ice. Its [[retina]] is [[Rod cell|rod]]-dominated and backed by a [[cat]]-like and reflective [[tapetum lucidum]], enhancing its low light sensitivity. Its [[cornea]] is lubricated by [[lacrimal gland]]s, to protect the eye from sea water damage.<ref name="Perrin-2009" />

On ice, the mother identifies her offspring by [[Olfaction|smell]]. This sense may also warn of an approaching [[predator]]. Underwater, the seal closes its nostrils, disabling its sense of smell.<ref name="Perrin-2009" />

Its whiskers, or [[vibrissae]], lie in horizontal rows on either side of its snout. They can sense to low-frequency [[vibration]]s, and may be able to detect movement of nearby animals during dives.<ref name="Perrin-2009" />