Variation
See dedicated page: Variation
Adults are sexually dimorphic.[1]
The shape and color of the wings change at the beginning of the migration and appear redder and more elongated than later migrants.[2] Wings size and shape differ between migratory and non-migratory monarchs. Monarchs from eastern North America have larger and more angular forewings than those in the western population.[3]
| Sexual dimorphism of monarchs | |||||||
|---|---|---|---|---|---|---|---|
| Female | Male | Description | |||||
![]() Adult female.  | 
![]() Adult male.  | 
 Males are slightly larger than females[3][4] and have a black patch or spot of androconial scales on each hindwing. The male's black wing veins are lighter and narrower than those of females.[1]  | |||||
| Varieties of monarchs | |||||||
|---|---|---|---|---|---|---|---|
| Caterpillar | Chrysalis | Adult | Description | ||||
![]() D. p. plexippus caterpillar.  | 
![]() D. p. plexippus chrysalis.  | 
![]() D. p. plexippus adult.  | 
 Short paragraph or so of descriptive text.  | ||||
![]() D. p. plexippus form nivosus, or the white monarch. Caterpillar pictured.  | 
![]() D. p. plexippus form nivosus chrysalis.  | 
![]() D. p. plexippus form nivosus adult.  | 
 Known informally as the "white monarch", but called nivosus by lepidopterists. It is grayish white in all areas of its wings that are normally orange and is only about 1% or less of all monarchs, but populations as high as 10% exist on Oahu in Hawaii. Also observed in Australia, New Zealand, Indonesia and the United States.[5]  | ||||
![]() D. p. nigrippus caterpillar.  | 
![]() D. p. nigrippus chrysalis.  | 
![]() D. p. nigrippus adult.  | 
 Short paragraph or so of descriptive text.  | ||||
![]() D. p. megalippe caterpillar.  | 
![]() D. p. megalippe chrysalis.  | 
![]() D. p. megalippe adult.  | 
 Short paragraph or so of descriptive text.  | ||||
![]() D. p. leucogyne caterpillar.  | 
![]() D. p. leucogyne chrysalis.  | 
![]() D. p. leucogyne adult.  | 
 Short paragraph or so of descriptive text.  | ||||
![]() D. p. portoricensis caterpillar.  | 
![]() D. p. portoricensis chrysalis.  | 
![]() D. p. portoricensis adult.  | 
 Short paragraph or so of descriptive text.  | ||||
![]() D. p. tobagi caterpillar.  | 
![]() D. p. tobagi chrysalis.  | 
![]() D. p. tobagi adult.  | 
 Short paragraph or so of descriptive text.  | ||||
- 1 2 "Monarch, Danaus plexippus". Archived from the original on 15 December 2012. https://archive.today/20121215095741/http://www.dbc.uci.edu/~pjbryant/biodiv/lepidopt/danaidae/monarchm.htm. Retrieved 27 August 2008.
 - ↑ Satterfield, Dara A.; Davis, Andrew K. (April 2014). "Variation in wing characteristics of monarch butterflies during migration: Earlier migrants have redder and more elongated wings". Animal Migration 2 (1). doi:10.2478/ami-2014-0001.
 - 1 2 "Petition to protect the Monarch butterfly (Danaus plexippus plexippus) under the endangered species act". Xerces Society. http://www.biologicaldiversity.org/species/invertebrates/pdfs/Monarch_ESA_Petition.pdf. Retrieved 1 September 2014.
 - ↑
 - ↑ Gibbs, Lawrence; Taylor, O.R. (1998). "The White Monarch". Department of Entomology University of Kansas. http://monarchwatch.org/read/articles/nivosus.htm. Retrieved 17 July 2014.
 



