Hummingbirds engage in territorial battles all day long. Sometimes playfully chasing each other - but Ive also seen many angry battles. They normally don't tolerate another hummer within their range of vision.
However, as darkness descends they suddenly cooperate at the feeders. Ive even seen a feeding hummer allow another to simultaneously feed at the same flower, actually seeming to enjoy each other's company.
Im just a stupid human occupying their world, so I assume a survival instinct kicks in and they empathize with their fellow birds - realizing they must all eat enough to survive throughout their long, dark period of torpor. Is that possible?
Any other theories why their behavior changes before nightfall?
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