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These animals typically contain abundant populations of rods in their retinas, which are often found in conjunction with a retinal tapetum .
This ‘eyeshine’ is not the iris color but that of the vascular membrane - the tapetum - showing through the translucent pigment layer on the surface of the retina.
A layer of tapetum at the back of their eyes greatly increases their ability to see at night as well; this also makes their eyes glow in the dark.
Passing over the ship's holds I look down upon sedate shoals of crescent-tailed bigeyes, their reflective tapetums looking like silver cataracts.
Only animals active at night have these tapetums , which underlie their light-retrieving retinas.
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