In these animals, melanin is absent from a section of the choroid and within that section a layer of highly reflective tissue, the tapetum lucidum, helps to collect light by reflecting it in a controlled manner.
U tih životinja melanin je odsutan s dijela žilnice i unutar tog dijela je sloj tkiva koja dobro reflektira, tapetum lucidum, pomažući skupiti svjetlo reflektirajući ga kontroliranim načinom.