A. curassavica does not cure or prevent the infection with OE, it merely allows infected monarchs to live longer, and this would allow infected monarchs to spread the OE spores for longer periods. The male's black wing veins are lighter and narrower than those of females. Monarchs from eastern North America have larger and more angular forewings than those in the western population.  While this will expand the breeding locations of the monarch, this will also have the effect of increasing the distance that monarchs must travel to reach their overwintering destination in Mexico, and this could result in greater mortality during the migration. Temperatures above 35 Â°C (95 Â°F) can be lethal for larvae, and eggs dry out in hot, arid conditions, causing a drastic decrease in hatch rate. Though each egg is 1⁄1000 the mass of the female, she may lay up to her own mass in eggs. The monarch butterfly exhibits the most highly evolved migration pattern of any known species of butterfly or moth and perhaps any known insect.  This difference may reduce the toxicity of monarchs whose larvae feed on that milkweed species, as a naturalist has reported that monarch caterpillars do not favor the plant.  Eggs take 3 to 8 days to develop and hatch into larva or caterpillars. Historically, on average there are 300 million monarchs. Committee on the Status of Endangered Wildlife in Canada, Monarch butterfly conservation in California, Administrator of the Environmental Protection Agency, "Conserving Monarch Butterflies and their Habitats", "Petition to protect the Monarch butterfly (, "IUCN Red List of Threatened Species, Version 2014.1", "Pre- and postzygotic isolation and Haldane rule effects in reciprocal crosses of, "Recurrent Domestication by Lepidoptera of Genes from Their Parasites Mediated by Bracoviruses", "If viruses transfer wasp genes into butterflies, are they GM? While monarchs have a wide range of natural predators, none of these are suspected of causing harm to the overall population, or are the cause of the long-term declines in winter colony sizes.  Owners of commercial butterfly breeding operations claim that they take steps to control this parasite in their practices, although this claim is doubted by many scientists who study monarchs.  In Nova Scotia, the monarch is listed as endangered at the provincial level, as of 2017. The 2016 increase was attributed to favorable breeding conditions in the summer of 2015. On other Hawaiian islands, the white morph occurs at a relatively low frequency.  On 14 August 2014, the Center for Biological Diversity and the Center for Food Safety filed a legal petition requesting Endangered Species Act protection for the monarch and its habitat, based largely on the long-term trends observed at overwintering sites. However, when given a choice, their favorite milkweed by far, is the Asclepias incarnata, common name: Swamp milkweed. The Soldier butterfly (Danaus eresimus) is also slightly smaller than the Monarch. The Queen butterfly (Danaus gilippus) is just slightly smaller than the Monarch. This parasite can rapidly build up in captive monarchs, especially if they are housed together. , One variation, the "white monarch", observed in Australia, New Zealand, Indonesia and the United States, is called "nivosus" by lepidopterists.  It has also been found in Bermuda, Cook Islands, Hawaii, Cuba, and other Caribbean islands:(p18) the Solomons, New Caledonia, New Zealand, Papua New Guinea, Australia, the Azores, the Canary Islands, Madeira, Gibraltar, the Philippines, and North Africa. The Queen is an orange-brown color with white spots and black borders. Overwintering adults become less toxic over time making them more vulnerable to predators. Mating is less dependent on pheromones than other species in its genus.  In addition, the plant's lack of cardiac glycosides may also make the plant unattractive to egg-laying monarchs.  See section on captive-rearing below. ( Linnaeus, 1758) Synonyms. Each caterpillar, or instar, is larger than the previous after molting, as it eats and stores energy in the form of fat and nutrients to carry it through the nonfeeding pupal stage. Monarch butterflies are of the most recognizable and beloved butterfly in North and Central America. Males are slightly larger than females and have a black patch or spot of androconial scales on each hindwing (in some butterflies, these patches disperse pheromones, but are not known to do so in monarchs).  Conservationists lobby agriculture companies to set aside areas that remain unsprayed to allow the butterflies to breed. In support of this, a recent study by a citizen scientist found that captive-reared monarchs have a lower migration success rate than wild monarchs do. This is either because of apostatic selection (i.e., the birds have learned the orange monarchs can be eaten), because of camouflage (the white morph matches the white pubescence of milkweed or the patches of light shining through foliage), or because the white morph does not fit the bird's search image of a typical monarch, so is thus avoided. Monarch butterfly is native to North American countries. It lacks banding coloration or tentacles.  New research also has shown that monarch larvae reared on tropical milkweed show reduced migratory development (reproductive diapause), and when migratory adults are exposed to tropical milkweed, it stimulates reproductive tissue growth..  The lack of long-term declines in the numbers of breeding, and migratory monarchs, yet the clear declines in overwintering numbers, implies there is a disconnect between these life stages, that must be growing. 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