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Monarch butterfly

Monarch butterflies: “Remarkable” instance of concurrent evolution

"It's remarkable that concurrent evolution occurred at the molecular level in all these animals," said UCR evolutionary biologist and study lead Simon "Niels" Groen. "Plant toxins caused evolutionary changes across at least three levels of the food chain!" 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 ›