Testing by the Xerces Society and the University of Nevada-Reno found that milkweed leaves, the main food source for the monarch caterpillar, were contaminated by 64 pesticides. One of these ...

Monarch caterpillar eating milkweed leaf. Pesticides and herbicides for weed control are linked to disappearing milkweed plants. More than 860 million milkweed stems (40%) were lost in the Midwest ...

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Inside the box are 30 to 36, tiny monarch caterpillars, each no bigger than a grain of rice. Armed with magnifying glasses, the students eagerly examine the caterpillars, setting the stage for an ...

Gardeners can counteract both of these problems. The orange milkweed is the only host plant for monarch caterpillars in the Plains states. Seeds can be ordered online and refrigerated for about 30 ...

Testing by the Xerces Society and the University of Nevada-Reno found that milkweed leaves, the main food source for the monarch caterpillar, were contaminated by 64 pesticides. One of these ...

A monarch butterfly at the Coastal Access Monarch Butterfly Preserve in Los Osos, Calif., on Jan. 20. (Gary Coronado / Los Angeles Times) ...

the food source for monarch caterpillars. One of these, called methoxyfenozide, is likely to be highly toxic to caterpillars and was in 96% of milkweed samples, but it is classified as ...

Check out: Young Humpback Whale Jumps Out of Seattle Bay. Central to the monarch’s life cycle is the milkweed plant. Monarch butterflies exclusively lay their eggs on milkweed, and the caterpillars ...

On the other, Fred Urquhart, a University of Toronto zoologist who, for decades, had been puzzling over an entomological conundrum: Where do monarch butterflies go in winter? “We have found them ...

The U.S. Fish and Wildlife Service’s proposed protection of the monarch butterfly as threatened under the Endangered Species Act ... “Because without that toxic latex, they won’t be poisonous as ...

Federal wildlife officials are proposing to list the monarch butterfly as a threatened species due to population declines, and researchers in Wisconsin hope it will prompt more conservation of monarch ...