He has very long dark antennae. Males have 13 segments in their antennae whereas females have 12 but these look more than a twelfth longer. You can also see he has seven abdominal segments (females have six).
I first saw him crawling around under the dish below the feeder and it seemed take him a long time to work out where the food was - the females take about five seconds!
This male was wary of approaching the maple syrup when workers were present. Several times they drove him off, perhaps a normal reaction to encourage males to disperse to other colonies.
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