Painted lady, a long distance flyer?

SteveL
SteveL Club Member Posts: 12,367
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edited October 2016 in Entertainment #1

have just watched a recording of the  BBC programme on the migration of the painted lady butterfly. Found it a bit disappointing. Short on science.  Never actually explained how they proved the butterfly flew all the way from morocco for a start. Showed
lots of tracking gadgets but didn't fully explain how they arrived at the results they'd collected.