Dang! I've never thought about it before. Burning to find the answer, I found:
Giraffes Really Are More Vulnerable To Lightning Strikes Because Of Their Ridiculous Necks
"Given that lightning bolts tend to hit tall objects, especially in open areas, the height of giraffes may make them particularly vulnerable to fatal electrocution," Rockwood Conservation scientist Ciska Scheijen wrote in the African Journal of Ecology
There a link to the journal, but it's pay walled.