Euploea tulliolus

{{Short description|Species of butterfly}}

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{{Speciesbox

| name = Dwarf crow

| image = Euploea tulliolus koxinga ventral view 20150202.jpg

| synonyms = * Euploea inquinata
(Butler, 1866) {{cite web | url=http://yutaka.it-n.jp/dan/30330010.html | title=Euploea tulliolus ledereri Felder & Felder,1860 | publisher=yutaka.it-n.jp | access-date=5 June 2013}}

| taxon = Euploea tulliolus

| authority = Fabricius, 1793

}}

Euploea tulliolus, the dwarf crow or small brown crow, is a butterfly found in the Solomon Islands, Malaysia, Taiwan, Vietnam, Singapore and Australia, that belongs to the crows and tigers, that is, the danaid group of the brush-footed butterflies family. It has a wingspan of about 4 to 8 centimeters.{{cite web | url=http://www.maolin-nsa.gov.tw/butterfly/ | title=紫蝶生??说 | access-date=5 June 2013 | archive-url=https://web.archive.org/web/20140119041453/http://www.maolin-nsa.gov.tw/butterfly/ | archive-date=19 January 2014 | url-status=dead }}

Due to the purple iridescence of the butterfly under sunlight, the butterfly is also commonly referred to as the purple crow.[http://www.brisbaneinsects.com/brisbane_nymphs/PurpleCrow.htm Purple Crow], Brisbane Insects

The Taiwanese population engages in a mass migration from the north of Taiwan to the south and back again. During the migration the main highway blocking their route has protective netting put in place and butterfly numbers are tracked with traffic restricted during the peak of the swarm's crossing.{{cite web |last1=Yi-ching |first1=Chiang |last2=Lo |first2=James |title=Southern freeway lane closed for purple crow butterfly migration |url=https://focustaiwan.tw/society/202203150023 |website=Southern freeway lane closed for purple crow butterfly migration |publisher=Focus Taiwan |access-date=15 March 2022}}