Quote:
Originally Posted by guidoLaMoto
As everyone knows, the reason they fly south for the winter is because it's too far to walk.
I'm always amazed at how fast large butterflies can fly-- as fast as birds over short distances-- 20 or 30 mph. Consider how light they are and the effects of wind resistance. Compare it to throwing a wad of tissue paper which quickly reaches its terminal velocity no matter how hard you heave it.
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When it comes to the butterfly's migration there is some research that suggest that they use the prevailing winds:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2929297/, If you scroll half way down that article to the section titled "Other navigational mechanisms" you can see some of that research. It amazes me that an insect, with such a small brain, can navigate thousands of miles and we, with our 'great brains', can have trouble leaving our neighborhood!