Mystery of the Migrating Martins

The PMCA has  posted a worthwhile  you tube video tracking 28 purple martins from Erie, Pa to South America and back using data from 2011-2014. Now you can  see where they fly each year in real time  and the route they take from data submitted from Data Geolocators and GPS tags. This is a fascinating mystery come to life through modern technology. View more…….

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