What is Milkweed butterfly?
{{Taxobox | name = Milkweed butterflies | image =Dark_Blue_Tiger_(Tirumala_septentrionis),_Striped_Blue_Crow_(Euploea_mulciber),_and_Common_Tiger_(Danaus_genutia).jpg | image_width = 240px | image_caption = Three Milkweed butterflies | regnum = [[Animal]]ia | phylum = [[Arthropod]]a | classis = [[Insect]]a | ordo = [[Lepidoptera]] | unranked_familia = [[Rhopalocera]] | familia = [[Nymphalidae]] | subfamilia = '''Danainae''' }} [[File:Danaus chrysippus male 2 by kadavoor.jpg|thumb|''[[Danaus chrysippus]]'', male with anal hairs.]] The '''Danainae''' is a [[subfamily]] of [[butterfly|butterflies]]. It [[wikt:belong|belongs]] in the [[Family (biology)|family]] [[Nymphalidae]]. There are over 200 species.<ref name=jas/> They are commonly known as '''Milkweed butterflies''' or '''danaids'''. These butterflies are common in [[tropical]] places all over the world.<ref>Ackery P.R. & Vane-Wright R.I. 1984. ''Milkweed butterflies, their cladistics and biology, being an account of the natural history of the Danainae, a subfamily of the Lepidoptera, Nymphalidae''. London.</ref> One of the most famous butterflies, the Monarch (''[[Danaus plexippus]]''), belongs in this subfamily.<ref name=jas>Scott, James A. 1986. ''The butterflies of North America.'' Stanford University Press, Stanford, CA. {{ISBN|0-8047-2013-4}}</ref> The larvae and the butterflies get [[poisonous]] [[glycoside]]s from their larval host plant, the [[milkweed]], so they become distasteful to [[predators]]. These milkweed butterflies (Monarch, Queen, Soldier) eat only milkweeds (''[[Asclepias]]'') as larvae. This highly effective defence strategy shields them against almost all predators. Birds soon learn to avoid these species after attempting to eat them. Males in this subfamily have anal hairs. This body part at the end of the [[abdomen]] can be pulled back inside the body. They also have spots on the bottom wings that release scents to [[wikt:attract|attract]] females. The male raises his [[abdomen]] and puts his hair pencils into the androconia. After