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migration

Eric Cassell on the mystery of Monarch butterfly migration

There exists no evolutionary model that satisfactorily explains its origin. That by itself does not prove that gradual evolution didn’t produce such programming, but the lack of such a model should at least give the open-minded pause for reflection. Read More ›

Rob Sheldon: Migrating birds’ mysterious quantum sense is “spooky”

Sheldon: "Since this sensing is happening at the level of electron spins and excitation, it is an inherently QM [quantum mechanical] effect, hence the title of the article." The spooky part is how finely tuned the bird's sensitivity is: "Packing a $10,000 lock-in amplifier into a 2 micron cell." Read More ›

Green darner dragonflies migrate over several generations

Like monarch butterflies. Apparently, the shimmering dragonfly migrates like the Monarch butterfly, taking three generations to loop across North America: At least three generations make up the annual migration of common green darner dragonflies. The first generation emerges in the southern United States, Mexico and the Caribbean starting around February and flies north. There, those insects lay eggs and die, giving rise to second generation that migrates south until late October. (Some in that second generation don’t fly south until the next year, after overwintering as nymphs.) A third generation, hatched in the south, overwinters there before laying eggs that will start the entire process over again. (from the chart) … An adult darner, regardless of where it was born, is Read More ›