Evolution.  A horn for an eye.
Harvey
P H
PH
Department of Zoology, University of Oxford, OX1 3PS, UK. paul.harvey@zoo.ox.ac.uk
Godfray
C J
CJ
D000818:Animals; D005075:Biological Evolution; D001517:Coleoptera / Q000033:anatomy & histology* / Q000254:growth & development; D017753:Ecosystem; D005123:Eye / Q000033:anatomy & histology / Q000254:growth & development; D005260:Female; D006733:Horns / Q000033:anatomy & histology / Q000254:growth & development; D008297:Male; D012641:Selection, Genetic; D012727:Sex Characteristics; D012726:Sexual Behavior, Animal