Yànwěidié de chìbǎng mòduān yǒu xiàng yànzi wěiba yíyàng de tūqǐ.
Swallowtail butterflies have tail-like extensions on their wings shaped like a swallow's tail.
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燕尾 ('swallow's tail') describes the forked tail-shaped extensions on the hind wings — the same naming logic as English 'swallowtail.' 燕尾服 is a swallowtail tuxedo.
