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is used to study migration patterns.<ref>{{cite web|url=http://www.birdcapemay.org/monarch.shtml|title=Monarch Monitoring Project|access-date=December...228 KB (22,257 words) - 17:36, 19 January 2025
population size and direction of flight.<ref>{{cite web |url=http://www.birdcapemay.org/monarch.shtml |title=Monarch Monitoring Project |accessdate=2008-12-05...15 KB (1,572 words) - 00:23, 20 May 2024