Well, it's one explanation for his erratic mood swings, unless he's constipated or having his period!!  (You know that's possible now, right?  OMG>>>)

https://www.westernjournal.com/horrifying-potential-culprit-found-behind-dwindling-north-american-moose-populations-spread-flies/

You hafta ask yourself honestly "WHY did God create flies??"  They serve absolutely no useful purpose and yet there's no way to get rid of them.  It's a conundrum.