Courser Bees are an important part of Hyrule's ecosystem, pollinating the various plants in the land. Link (over the charred remains of a forest where the bees resided): And their honey is apparently good for upgrading armor, so death to them all.

602 - The Secret Life (and death) of Bees
Who's the REAL calamity in Hyrule?
#SDComics #BreathOfTheWild #armor #TunicOfTheWild #upgrade #materials #farming #grinding #CourserBees #CourserBeeHoney #valuableresource #extermination #imamonster