There are only five well-documented fatal lightning strikes on giraffes between 1996 and 2010. But due to the population of the species being just 140,000 during this time, it makes for about 0.003 lightning deaths per thousand giraffes each year. This is 30 times the equivalent fatality rate for humans.
Pic by Luca Galuzzi
It's their feet. They have four, so have twice as many as humans. But lightning works exponentially.
what kind of lightning works exponentially?
If they're referring to how the cross sectional area scales exponentially with the radius it almost makes sense