Beetles exhibit a wide range of polarizing properties that have been replicated by
nanoengineers. The colored regions of Stephanorrhina guttata (a) preserve polarization
state on reflection but the white patches depolarize, Calloodes grayanus (b) and
Anoplognathus parvulus (c) are left-circular polarizers, and Chrysina resplendens (d) is
both a left- and right-handed reflector. For details see the paper by Hodgkinson et al., pp. 4558-4567.