Milbert's Tortoiseshell
Aglais milberti (Godart, 1819)
Family: Nymphalidae
Subfamily: Nymphalinae
Identification: Forewing tip squared-off. Upperside is black with a wide orange submarginal band which grades to yellow at the inner edge of band. Narrow black marginal border on both wings; the hindwing border may contain some blue spots.
Wing Span: 1 5/8 - 2 1/2 inches (4.2 - 6.3 cm).
Life History: In the afternoon, males perch on hillsides, banks of gulches, logs, or behind bushes to watch for females. Eggs are laid in large batches of up to 900 on the underside of host plant leaves. Young caterpillars feed together in a web, while older ones feed alone and make shelters of folded leaves tied with silk. Adults hibernate, sometimes in small groups.
Flight: Two broods from May-October.
Caterpillar Hosts: Nettles (Urtica dioica and U. procera).
Adult Food: Usually flowers, such as thistles, goldenrods, and lilacs; probably also sap and rotting fruit.
Habitat: Wet areas near woodlands, moist pastures, marshes.
Range: Boreal North America south of the taiga. Southern Alaska south to California, Nevada, and New Mexico; east to Newfoundland and West Virginia.
Conservation: Not required.
NCGR:
Management Needs: None reported.
Alternate Scientific Names:
Nymphalis milberti
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Verified Sightings
Displaying 1 - 24 of 2756 verified sightings
Observation date: Sep 14, 2009
Submitted by: hank4044
Region: Lake County, Montana, United States
Verified by: J_Martineau
Verified date: Nov 03, 2025
Observation date: Sep 20, 2025
Submitted by: NikkiM
Region: Carbon County, Montana, United States
Verified by: J_Martineau
Verified date: Oct 02, 2025
Observation date: Sep 10, 2025
Submitted by: skybirdmt
Region: Fergus County, Montana, United States
Verified by: J_Martineau
Verified date: Sep 15, 2025
Observation date: Aug 30, 2025
Submitted by: Cascade Colors
Region: San Miguel County, Colorado, United States
Verified by: mikefisher
Verified date: Sep 14, 2025
Observation date: Jun 07, 2025
Submitted by: Kate McKay
Region: Alberta, Canada
Verified by: Paul Prappas
Verified date: Sep 10, 2025
Observation date: Jul 23, 2025
Submitted by: jrmbutterfly
Region: British Columbia, Canada
Verified by: Paul Prappas
Verified date: Sep 10, 2025
Observation date: Aug 14, 2025
Submitted by: jrmbutterfly
Region: British Columbia, Canada
Verified by: Paul Prappas
Verified date: Aug 17, 2025
Observation date: Aug 22, 2024
Submitted by: jthompson6112
Region: Blaine County, Idaho, United States
Verified by: stevekohler
Verified date: Aug 06, 2025
Observation date: Mar 25, 2025
Submitted by: Happyville Comm...
Region: Bonneville County, Idaho, United States
Verified by: stevekohler
Verified date: Aug 06, 2025
Observation date: Jul 06, 2025
Submitted by: NikkiM
Region: Carbon County, Montana, United States
Verified by: J_Martineau
Verified date: Jul 10, 2025
Observation date: Jun 27, 2025
Submitted by: Cascade Colors
Region: Jackson County, Colorado, United States
Verified by: mikefisher
Verified date: Jun 29, 2025
Observation date: Jun 25, 2025
Submitted by: TaliahK
Region: Alberta, Canada
Verified by: James Steen
Verified date: Jun 27, 2025
Observation date: Jun 13, 2025
Submitted by: DeepSkyKelly
Region: Colfax County, New Mexico, United States
Verified by: stevecary
Verified date: Jun 14, 2025
Observation date: May 31, 2025
Submitted by: NikkiM
Region: Carbon County, Montana, United States
Verified by: J_Martineau
Verified date: Jun 11, 2025
Observation date: May 23, 2025
Submitted by: MAKI
Region: Lassen County, California, United States
Verified by: Ken Davenport
Verified date: May 29, 2025
Observation date: Apr 10, 2025
Submitted by: sgguthart
Region: Larimer County, Colorado, United States
Verified by: mikefisher
Verified date: May 11, 2025
Observation date: Apr 20, 2025
Submitted by: Luna-Linuche.76
Region: Klamath County, Oregon, United States
Verified by: Ken Davenport
Verified date: Apr 23, 2025
Observation date: Apr 11, 2025
Submitted by: NikkiM
Region: Stillwater County, Montana, United States
Verified by: J_Martineau
Verified date: Apr 16, 2025
Observation date: Mar 02, 2025
Submitted by: bonfrey
Region: Saguache County, Colorado, United States
Verified by: mikefisher
Verified date: Mar 15, 2025
Observation date: Mar 13, 2025
Submitted by: DeepSkyKelly
Region: Union County, New Mexico, United States
Verified by: stevecary
Verified date: Mar 14, 2025
Observation date: Mar 01, 2025
Submitted by: Cactuswren1976
Region: Los Alamos County, New Mexico, United States
Verified by: stevecary
Verified date: Mar 04, 2025
Observation date: Jun 25, 2024
Submitted by: Joshua C
Region: Los Alamos County, New Mexico, United States
Verified by: stevecary
Verified date: Feb 28, 2025
Observation date: Jul 03, 2019
Submitted by: emma.stevens
Region: Ontario, Canada
Verified by: jwileyrains
Verified date: Jan 03, 2025
Observation date: Sep 14, 2024
Submitted by: ezeemonee
Region: Teller County, Colorado, United States
Verified by: mikefisher
Verified date: Nov 09, 2024
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