The seasonal migrations that occur in the animal kingdom annually vary in scale on many levels and cover nearly all classifications and all ecosystems of land, sea and air. Climactic conditions and other environmental changes impact these movements on a regular basis. In the case of the monarch butterfly migrations from North America to Mexico, the fragile balance is especially evident as populations are noticably dropping due to habitat loss, insecticide/herbicide use and extreme weather. (An interesting note in this case is that the migration itself was initially caused by human impacted landscape changes when the great North American forests began to be cleared for agriculture in the 1600s.)
Milkweed is the sole food plant for the monarch caterpillers. Continue reading



















