What feature gives the swallowtail family its common name?
Answer
Fleshy, horn-like appendages extending from the rear end
Swallowtails receive their common name from the presence of 'tails'—fleshy, horn-like appendages that extend from the rear end of the body, although this trait may not be visible on the youngest larvae.

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Meet The Black Swallowtail Caterpillar - YouTube
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