mourning cloak butterfly
US /ˈmɔːrnɪŋ kloʊk ˈbʌtərflaɪ/
UK /ˈmɔːrnɪŋ kloʊk ˈbʌtərflaɪ/

1.
borboleta-casaco-de-luto
a large, dark-colored butterfly (Nymphalis antiopa) with a distinctive yellow or white border on its wings, found in North America and Eurasia.
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The mourning cloak butterfly is one of the first butterflies to emerge in spring.
A borboleta-casaco-de-luto é uma das primeiras borboletas a emergir na primavera.
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We spotted a beautiful mourning cloak butterfly resting on a tree trunk.
Vimos uma linda borboleta-casaco-de-luto descansando em um tronco de árvore.