Boy, S.C.; Raubenheimer, E.J.; Marais, J.; Steenkamp, G. 2015. White rhinoceros Ceratotherium simum horn development and structure: a deceptive optical illusion. Journal of Zoology, London 296: 161-166. { copied = true; setTimeout(() => copied = false, 10000); }).catch(err => { console.error('Failed to copy:', err); }); " type="button" :class="copied ? 'bg-secondary border-secondary' : 'border-primary hover:bg-primary'" class="group min-w-64 flex items-center justify-between gap-5 border border-solid px-5 py-2 cursor-pointer transition-colors"> PDF download available