Black Swallowtail (Papilio polyxenes) lives in open fields across Throughout much of North America. It feeds on carrot and parsley. Its conservation status is Least Concern.
Fascinating facts about the Black Swallowtail
- The black swallowtail caterpillar possesses a bright orange, forked organ called the osmeterium that resembles a snake's tongue. When a predator approaches, the caterpillar everts this structure and releases a foul-smelling chemical that repels birds. This defensive tactic is effective because the osmeterium's appearance and odor are startling to potential attackers, reducing the likelihood of predation. The organ is a distinctive feature of the species' larvae.
- Male black swallowtails establish and defend small territories that they use for mate location and courtship. Once a male secures a perch, he maintains exclusive use of that site about 95% of the time, aggressively chasing away intruding rivals. These territories are not tied to nectar or host plants, so the male's presence is the sole resource for visiting females. The high occupancy rate reflects the intense competition among males for these display sites.
- Black swallowtails gather in leks, where males congregate at specific display sites without providing any parental care. At these leks, females move among the clusters and select mates solely based on the males they encounter, as the only resource present is the males themselves. This system satisfies the four classic criteria for lekking behaviour, including male aggregation and female choice.
- Female black swallowtails closely resemble the pipevine swallowtail on the upper side of their wings, a form of dorsal mimicry that makes birds less likely to target them. This similarity is advantageous because females spend much of their egg-laying time with their dorsal wing surface exposed, increasing the benefit of looking like the unpalatable model.
Sources
Every fact above was checked against these pages, and kept only where one of them states it.
At a glance
RangeThroughout much of North America
HabitatOpen fields
DietCarrot and parsley
About the Black Swallowtail
As the black swallowtail dances through the sun-drenched meadows, its iridescent wings beat with a hypnotic rhythm, casting a mesmerizing spell on all who witness its ethereal flight. With delicate precision, it alights upon the tender shoots of its host plants, uncoiling its proboscis to sip the sweet nectar that fuels its nomadic existence. In a whirl of dark beauty, this majestic butterfly weaves its way through the landscape, a living embodiment of the wild and untamed spirit that thrives in the uncharted corners of our world.
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