A close-up of the right eye of an alligator, in which the elliptical nature of the pupil can be seen - this is characteristic of nocturnal animals which are also active during daylight hours, and enables the pupil to be closed rapidly in bright light if necessary. The pupil is circular at night, when light levels are low, and the reflective tapetum lucidum layer at the back of the retina creates a red eyeshine in torchlight.
Photograph © Adam Britton
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