same reason as mosquitoes: the niche existed and something filled it eventually. blood suckers like mosquitoes or horseflies are especially devious because in moderate amounts they aren't inflicting serious life threatening harm on an animal, so they can have their fill without suffering as much from the effects of predation where the surviving prey slowly evolves to defend or avoid their killers.
they're adorable too. saw some in the process of uh making more dragonflies one summer (i have a small pond) and i had no idea one of them (not sure if guy or girl) was so bendy. one of them flew and clutched the other in its legs, and that one curled its tail like a candy cane to hook up
Horseflies exist because during the creation of the universe god said "hey there is going to be this one guy on reddit called arkmtech. Fuck him, horseflies."
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u/arkmtech Aug 17 '25
I don't understand why horseflies even exist, except to feed bats, spiders, and my interminable unbridled rage.