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Index of Subjects Just a guess but aquatic insects, at mating/egg laying stage, tend to be attracted by polarized light because this means open water. Yt, Dave Webster, Kentville ----- Original Message ----- From: "nancy dowd" <nancypdowd@gmail.com> To: "naturens" <naturens@chebucto.ns.ca> Sent: Friday, July 19, 2013 2:44 PM Subject: [NatureNS] directional mayfly > This mayfly (Ephemeroptera) landed on my shirt Wednesday evening. It > is possibly one of the burrowing mayflies (Ephemeridae). Perhaps > someone knows its ID: > http://www.flickr.com/photos/92981528@N08/9319239733/ > > I nudged it onto a paper to show its 2 tail filaments using the flash: > http://www.flickr.com/photos/92981528@N08/9319237905/ > > The really interesting thing about this mayfly was how it maintained > its direction. Every time I moved the paper for a better view it would > immediately move back to its original bearing (approximately south) > just like a compass needle. I have no idea what it could be orienting > towards (direction, sun, wind, smell) or if this is normal for > mayflies and perhaps other insects that emerge en masse to breed (such > as flying ants). > > Nancy > > > ----- > No virus found in this message. > Checked by AVG - www.avg.com > Version: 2013.0.3349 / Virus Database: 3204/6490 - Release Date: 07/14/13 >
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