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A distinguishing characteristic of a deer fly is patterned gold or green eyes. Males feed on plant juices. Females feed on blood from mammals.
North America, they are often found in damp environments, such as wetlands or forests.
There were quite a few deerflies around Algonquin. I received some painful bites after which I swelled a little locally,like a weak bee sting, for a few hours. The first 3 are one that was stunned after being swatted by my friend she was biting. The last 3 are one on my hammock and then one on my hand. I was waiting for the one on my hand to bite me while I was photographing it, but it didn't.