BIG NUM­BER

Chicago Sun-Times - - OUTDOORS -

More than 1 bil­lion: Milk­weed stems in the Up­per Mid­west in com­ing years to sus­tain the monarch mi­gra­tion, ac­cord­ing to a new study by Monarch Watch di­rec­tor Chip Tay­lor and col­leagues, pub­lished in the jour­nal Fron­tiers in Ecol­ogy and Evo­lu­tion.

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