Eastern tiger swallowtail facts for kids
Quick facts for kids Eastern tiger swallowtail |
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Scientific classification  |
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| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | Insecta |
| Order: | Lepidoptera |
| Family: | Papilionidae |
| Genus: | Papilio |
| Species: |
P. glaucus
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| Binomial name | |
| Papilio glaucus Linnaeus, 1758
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The eastern tiger swallowtail (Papilio glaucus) is a large, colorful butterfly native to eastern North America. It is one of the most familiar insects seen fluttery in warm gardens, woodlands, and backyards. People recognize it easily by its bold colors and distinct patterns. Its large wingspan can reach from 7.9 to 14 centimeters wide. Males are bright yellow with dark bands that look like stripes on a tiger. Some females look like the males, while other females are nearly black. They produce two or three generations of broods every year from spring to fall. Because of its beauty, several states honor this insect. It serves as the official state butterfly of Alabama, Delaware, Georgia, North Carolina, and South Carolina. It is also celebrated as the official state insect of Virginia.
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What Does the Eastern Tiger Swallowtail Look Like?
The eastern tiger swallowtail is famous for its grand, swooping wings. Its full wingspan stretches between 7.9 and 14 centimeters across. Females are generally larger than the males in this species. Insects that live in warm southern areas often grow bigger than northern ones. Both wings end in delicate tails that resemble the tails of swallow birds. Males show bright yellow wings marked by four bold black stripes. The edges of the wings feature black borders dusted with bright yellow spots. Underneath their hind wings, you can spot touches of blue and red scales.
Females display a special biological trait known as dimorphic forms, meaning they come in two colors. The first kind of female is the yellow morph. She looks very similar to the male insect. However, her hindwings contain a wide band of iridescent blue spots. The second kind is called the dark morph. Her body and wings are mostly deep charcoal gray or black. A faint outline of the classic stripes often shows on her lower wings. This dark design helps her hide from hungry birds in the woods.
[[File:Eastern Tiger Swallowtail at Athens Botanical Garden.jpg|thumb|Eastern Tiger Swallowtail at the State Botanical Garden of Georgia
In very rare cases, butterflies can develop as a natural gynandromorph. This rare creature shows male traits on one side and female traits on the other. Sometimes, individuals display bright patches like color mosaics across their wings. Scientists love finding these unique insects along areas where different swallowtails meet.
Looking at Related Swallowtails
Several other butterflies look very similar to this species in the wild. The dark female looks like the poisonous pipevine swallowtail (Battus philenor). It also mimics the pretty spicebush swallowtail (Papilio troilus). Furthermore, it looks a lot like the dark female black swallowtail (Papilio polyxenes). The true pipevine swallowtail has bright spots on every wing margin. In contrast, the spicebush swallowtail shows two rows of bright orange spots underneath.
Two close relatives share similar yellow and black patterns. The Canadian tiger swallowtail lives farther north and has smaller wings. Another close relative is the Appalachian tiger swallowtail, called Papilio appalachiensis. This mountain relative is larger than Papilio glaucus. You can tell Papilio glaucus apart by the broken yellow bar beneath its forewings.
History and Scientific Taxonomy
Long ago, European explorers noticed this bright creature fluttering across the American wilderness. The very first drawing of a North American butterfly showed this species. The artist John White drew it in 1587 during an expedition led by Sir Walter Raleigh. White recorded its name as "Mamankanois" from the local Carolina Algonquian word.
Later in history, the famous scientist Carl Linnaeus studied preserved specimens. He named it in the landmark 10th edition of his book Systema Naturae in 1758. Today, some scientists who work in insect classification place it in the genus Pterourus. For many decades, scientists believed that northern and southern types belonged together. In 1991, experts decided the northern group was a separate subspecies named Papilio glaucus canadensis. Later in 2002, researchers discovered that mountain swallowtails formed the unique species Papilio appalachiensis.
Where Do Eastern Tiger Swallowtails Live?
[[File:Eastern tiger swallowtail on a bush in Oklahoma.jpg|thumb|Specimen on a flowering bush in Eastern Oklahoma]] These butterflies range across the eastern United States all the way to Texas. Their territory extends northward to southern Ontario and parts of Vermont. They thrive south through the state of Florida, reaching broad fields and rivers. However, they are practically absent from the southernmost coral islands called the Florida Keys. In 1932, a single butterfly was found far away in County Wicklow, Ireland. That lonely insect probably hitched an accidental ride across the ocean on a ship.
This insect easily adapts to living anywhere that broad deciduous trees flourish. You can spot them gliding through woodlands, creek banks, meadows, and sunny roadsides. They even flutter through quiet city yards and busy suburban parks. Because they live easily in many environments, they act as a generalist insect. The species is thriving in huge numbers and is not considered a threatened animal.
How Eastern Tiger Swallowtails Behave
Eastern tiger swallowtails are active only during the daytime, making them strictly diurnal. They usually fly alone through the sunlit woods instead of in groups. They are powerful flyers that often cruise high above the forest tree canopy. Adult males spend sunny mornings patrolling clearings to search for waiting females. When a pair meets, they flutter around each other in midair courtship. During this aerial dance, the male produces sweet-smelling scent chemicals to attract the female.
Both male and female butterflies need lots of energy to keep flying. They drink sweet nectar from wild blooms in the dogbane family Apocynaceae. They also visit daisy flowers belonging to Asteraceae and pea flowers in Fabaceae. Swallowtails are famously polyphagous, which means they drink from hundreds of different blooms.
Males often participate in an exciting natural behavior called puddling. They gather on wet sand, damp mud, or moist dirt beside dirt trails. By sipping muddy water, they collect vital sodium minerals and special salts. These precious nutrients help them stay strong and successfully reproduce. Females rarely join puddles because they gather the minerals they need from nectar.
Life Cycle and Stages of Development
Swallowtails experience complete change as they grow, moving through four clear body stages. They begin as an egg, transform into a caterpillar, form a chrysalis, and emerge. In warm southern areas, three separate broods can fly in a single year. In cooler northern places, they usually finish just one or two generations each summer.
The Egg Stage
A female lays each round egg all by itself on host leaves. She prefers to place eggs on fresh leaves near sweet nectar sources. Each egg is quite large for an insect, measuring roughly 1.2 millimeters across. It starts bright green before darkening with small reddish speckles. Depending on the outdoor warmth, the baby larva hatches in 4 to 10 days.
The Caterpillar Stage
When the caterpillar hatches, it starts chewing on host plant leaves right away. To keep safe, it spins a tiny silk mat across a leaf. The silk shrinks slightly, curling the leaf edges around the insect to hide it. As it eats and gets bigger, the larva sheds its skin through molting. The caterpillar goes through five distinct growth periods called instars.
During its first three instars, the caterpillar is dark brown with a white patch. This pattern looks remarkably like fresh bird droppings, tricking passing birds. When it reaches its fourth and fifth stages, its body turns bright green. Its large, swollen head section, called the thorax, develops two dramatic fake eyespots. These spots shine black, yellow, and bright blue, scaring off smaller predators. Right before it enters its transformation, the caterpillar turns dull brown and reaches 5.5 centimeters.
The Chrysalis Stage
When the caterpillar finishes growing, it stops eating and searches for a resting spot. It spins a silk button on bark and loops a silk belt around its chest. Then it molts one final time to form a hard, shell-like chrysalis. The chrysalis measures around 3.2 centimeters long and blends into surrounding tree bark. It can appear grayish white or mottled brown, matching nearby tree trunks and fences. During cold autumn months, the chrysalis enters winter winter rest. It survives freezing temperatures outside until warm spring sunshine signals it to hatch.
Common Host Plants
Young caterpillars feed on many different trees, especially those in the magnolia family Magnoliaceae. They also love eating various fruit trees belonging to the rose family Rosaceae. Unlike other picky butterflies, this caterpillar feeds happily on several plant families. They easily digest leaves from trees in Lauraceae, Oleaceae, Rutaceae, and Tilioideae.
- Wild black cherry (Prunus serotina)
- Ash trees belonging to the genus Fraxinus
- Cottonwood trees found in the genus Populus
- Wafer ash, also called hoptree (Ptelea trifoliata)
- Fragrant common lilac bushes (Syringa vulgaris)
- Sweet bay magnolia (Magnolia virginiana)
- Towering tulip poplar trees (Liriodendron tulipifera)
- Water-loving willow trees from the genus Salix
While Canadian swallowtails love to eat quaking aspen, southern tiger swallowtail larvae struggle on it. Their survival rate drops to just fifteen percent when eating aspen leaves. They prefer sweet bay, tulip tree leaves, and native cherry branches instead.
Clever Defenses Against Danger
Eastern tiger swallowtails use clever tricks to survive in the wild without getting eaten. As tiny young larvae, they disguise themselves completely to mimic white bird droppings. When they grow into large green caterpillars, they use their big colorful eyespots. Birds flying past often mistake the round spots for the eyes of a snake.
If an enemy comes too close, the caterpillar pops out a hidden orange organ. This y-shaped fleshy gland is known as an osmeterium. Located right behind its head, this horn emits smelly chemicals called terpenes. The awful smell drives away curious ants, bugs, and hungry birds.
Adult butterflies use protective coloration to stay alive around hungry animals. Dark females rely on a special trick called Batesian mimicry. They copy the dark colors of poisonous pipevine swallowtails to fool hungry vertebrate animals. Birds learn that pipevine swallowtails taste terrible and make them sick. When a bird spots a dark female tiger swallowtail, it avoids eating her. This clever trick keeps dark females safe, especially in warm southern states.
Related Butterflies
