I've heard they can be intense, I was raised in southern swamps so I'm not sure if it's any different. I've been in clouds of mosquitoes where you couldn't see the through them to the other side. The big flys are the ones that'd scare me. Mosquito netting is a must as the amount of repellent needed would start to poison you. I only ask because the couple people I know mentioned the bugs. They weren't from where I was so I don't know the context they were coming from.
Swamps are worse than here. Alaska is worse than here. Our deer flies are about the size of big houseflies, buzz around your head in circles, they have quite a bite. The moose flies are big, maybe 1" to 1.25" long, less aggressive than deer flies but very stealthy. They have a similar bite but much less plentiful compared to mosqitoes, black flies and deer flies.
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