Don't have any piece of though on why they moved ? There is sometimes general studies calling people to share when some being desapear, like here in france I receiv mails from a studie on Lucioles (light insects) because it is an indice of biodiversity, and they try to know why they desapear from that or that places...

Such beautiful pictures... Really great shots !
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@permatek - My last post : Around the World : Ljubljana