the monarch butterflies return to mexico in november.
when do the monarch butterflies return to mexico?
november
fred urquhart





















































frederick albert urquhart, (december 13, 1911 – november 3, 2002) was a canadian zoologist who studied the migration of monarch butterflies, "danaus plexippus" l. together with his wife, norah roden urquhart (june 23, 1918 – march 13, 2009), he identified their migration routes and discovered that the migration spans multiple generations of butterflies. after many years of searching and with the help of catalina trail and ken brugger, the urquharts found the location in mexico where the butterflies spend their winter, far away from their summer residence areas in canada and the united states.





















































section::::monarch research.
fred urquhart
it is a concern in the morbidity of monarch butterflies. researchers do not all agree that a high census of "l. archippivora" may regulate the population or have an effect on the fall migration of eastern monarch butterflies to mexico. the butterfly does not survive the infection and it is estimated that 6.2% of wild-monitored monarch butterflies are killed by this fly. one study indicated that even the eggs of the monarch butterfly can be infected.
lespesia archippivora