brush-footed butterfly
US /ˈbrʌʃˌfʊtɪd ˈbʌtərflaɪ/
UK /ˈbrʌʃˌfʊtɪd ˈbʌtərflaɪ/

1.
any of numerous butterflies (family Nymphalidae) that have the first pair of legs reduced and brushlike and are typically brightly colored
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The monarch is a well-known example of a brush-footed butterfly.
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Many species of brush-footed butterflies are found in tropical regions.