Only butterflies, like these monarchs, and moths are called caterpillars during their larval stage. The caterpillar crawls away from the milkweed plant in search of a safe spot to begin the pupa ...

The body mass of fifth-stage caterpillars has increased about 2,000-fold from first stage instars. Larvae must eat constantly to ingest enough milkweed to increase in mass so dramatically within a few ...

The questions include: What portion of each native milkweed from last year germinated, and of those that germinated, how many survived last winter and resprouted this spring? How many gardeners ...

from the egg stage through adulthood, can survive exposure to the chemicals. Milkweed tolerance has its price, though. Monarch flies became temporarily paralyzed when the vial they were contained ...

RIO GRANDE CITY, Texas— The U.S. Fish and Wildlife Service today protected the prostrate milkweed as endangered. Only 24 populations of the plant survive, in south Texas and northern Mexico, where ...

(common milkweed) is known to contain sufficient amounts of cardiac ... We find that all parts of the plant contain significant levels of cardiac glycosides at all stages of growth. Plants harvested ...