The fascinating and complex evolutionary relationship of the monarch butterfly and the milkweed plant monarch butterflies are one of natures most recognizable creatures known for their bright colors and epic annual migration from the united states and canada to mexico. Monarchs have not only evolved a tolerance for milkweed poisons they have developed ways to turn them to their advantage rather than excreting cardenolides in waste pellets monarch caterpillars and butterflies sequester the chemicals in body tissue making them unpalatable to in sects and birds that might otherwise find them attractive prey. Monarchs and milkweed is not only a good scientific text but also merits reading for its excellent blending of the monarch and milkweed relationship with history molecular biology geography and social science it presents thorough and relevant scientific information of interest and use to entomological professionals and to people involved . Interactions with milkweed common milkweed asclepias syriaca flower buds and leaves photo wendy caldwell monarch larvae are specialist herbivores of plants in the family asclepiadaceae milkweeds and have been recorded feeding on 27 different north american species in this family malcolm and brower 1989
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