Eastern Tiger Swallowtail

Fascinating facts about the Eastern Tiger Swallowtail

• The eastern tiger swallowtail's wingspan stretches from just under eight centimetres to a full fourteen centimetres, placing it among the larger swallowtails in North America. Females are the larger sex, often reaching the upper end of this range. Individuals from southern parts of the range tend to be bigger than those from the north, so a southern female can be noticeably broader than a northern counterpart.
• Female eastern tiger swallowtails display a striking dimorphism, appearing either in a yellow form or an almost entirely black form. The yellow morph mirrors the male's colouration but adds a conspicuous band of blue spots along the hindwing, giving it a distinctive appearance. In contrast, the dark morph replaces the usual yellow areas with dark gray or black, making the butterfly look nearly black overall.
• The eastern tiger swallowtail is one of the few papilionid butterflies known to produce gynandromorphs, individuals that are half male and half female. Most bilateral gynandromorphs arise from hybrids between this species and the Canadian tiger swallowtail and are found along their hybrid zones. Within the central part of the species' range, colour mosaics of these mixed individuals are recorded, adding to the butterfly's remarkable variability.
• When a predator approaches, the eastern tiger swallowtail caterpillar can flip out an orange, fleshy osmeterium that releases foul-smelling terpenes, making the larva look like a small snake. Earlier in its development the first three instars resemble bird droppings, a camouflage that helps them avoid being eaten. As they grow, bright eyespots on the thorax appear and work together with the osmeterium to further deter birds.

Sources

Every fact above was checked against these pages, and kept only where one of them states it.

• Wikipedia

At a glance

About the Eastern Tiger Swallowtail

As the Eastern Tiger Swallowtail dances through the sun-dappled forest, its iridescent wings beat in a hypnotic rhythm, casting a shimmering glow across the leafy underbrush. With each delicate flutter, the butterfly's tail streams behind it like a golden banner, leaving a trail of wonder in its wake as it sips nectar from the sweetest wildflowers. In its effortless, soaring flight, the Eastern Tiger Swallowtail embodies the very essence of elegance and freedom, a true marvel of nature's artistry.

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