A large, black and yellow butterfly nectars on periwinkle colored flower. — Swallowtails We can help identify Indiana swallowtails! © Trevor Edmonson/TNC

Indiana Nature Notes for August

By Alyssa Nyberg, Restoration Ecologist | Last updated August 01, 2025

Alyssa Nyberg Restoration Ecologist

Whose Tail is That?!

Our August skies are aflutter with butterflies over the Kankakee Sands prairie. The nectar-rich flowers of the blazing stars, milkweeds and bonesets are decorated by the wings of a variety of butterflies, including the swallowtails.

A fun (and sometimes challenging) part of being among so many butterflies is trying to identify them. A good place to start is the larger forewings which are closer to the head, and the two smaller hind wings which are nearer its bum. We can view the wings from above, which may have a particular pattern or view from below, which may have a different pattern altogether!

Put your butterfly ID skills to the test!

Visit Kankakee Sands!

Tips for identifying butterflies

Butterflies are fast fliers! You might do well to wait until they settle down on a flower rather than try to run after them. Running in a prairie can be a tripping hazard!
Find a nice patch of flowers in full bloom and take a seat. On a warm day, often the butterflies will find you.
When they are relaxed and comfortable, they will often spread their wings open, giving you a nice view of their wing pattern.
When they are hot, they often fold their wings in, giving the admirer a good view of the underside of the wings.
And remember that when the wings are closed, you often have a nice view of the butterfly’s body, which can be a variety of colors with spots, lines or dots.

Feeling good about ID’ing butterflies? Let’s take it to the next level and try to identify the three different swallowtail species commonly found in northwest Indiana. All three swallowtails have a tell-tale tail that identifies them as being a swallowtail. This appendage is an extension of the hindwing which is thought to lure predators to nibble the less important back wing of the butterfly, rather than the important head and antennae.

I have found that telling swallowtails apart can be a little tricky, yet they have relatively easily observable differences that can be seen both in flight and while resting that allow you to tell one from the other.

Black Swallowtail Black swallowtail at Kankakee Sands © Trevor Edmonson/TNC

Black Swallowtail

The black swallowtail (Papilio polyxenes asterius) feeds on plants in the carrot family such as parsley and Queen Anne’s lace. Perhaps you have seen them in your own garden? If you have, then you’ve seen the green striped caterpillar. Should you try to pick it up, get ready to be startled by fleshy orange horns that spring out from the head in an effort to scare you into dropping it!

When the butterfly is at rest with its wings open, you will note two rows of yellow spots all along the outside of the wing margin, and a blush of a blue on the hindwings. If you get a chance to see the black swallowtail with its wings folded together above its body, you will find that it has a dark body with yellow spots on its abdomen.

Spicebush Swallowtail Spicebush swallowtail © Jeanette Jaskula

Spicebush Swallowtail

The spicebush swallowtail (Papilo triolus triolus) feeds on, no surprise, spicebush!, and also on sassafras trees.

When viewed from above with its wings open, this butterfly also has dark wings like the black swallowtail. However, it has only one row of pale spots. When the wings are folded, you are afforded a nice view of the wings’ undersides which reveals two rows of orange spots along the edges of the hindwing. Look closely—one orange spot is missing and in its place is a splash of blue, often referred to a blue shooting star. The abdomen and torso of the spicebush swallowtail are adorned with yellow spots on both—super cool looking!

Tiger Swallowtail Tiger swallowtail butterfly on milkweed at Versailles State Park in Ripley County. © TNC

Eastern Tiger Swallowtail

The Eastern tiger swallowtail (Papilio glaucus) feeds on a variety of woody plants, such as wild cherry, willow and birch. Eastern tiger swallow tail keeps us on our toes by having two forms to know—a yellow form and a dark form!

Yellow form Eastern tiger swallowtail butterflies have wings which, when viewed from above, are yellow with black tiger-like stripes. The yellow is bounded by black, and on the edge of the wings in this black border are one row of yellow spots. Gorgeously, the body of the yellow form is also yellow with black tiger-stripe markings.

Dark form Eastern tiger swallowtail butterflies are always female; no males exhibit this color pattern. When viewed from above, the forewings of the female butterfly are all dark grey-black in color with just one row of yellow spots along the edge of wings. In addition to the dark wings, its body is also dark and lacks markings.

If you get these facts down, should a bird nibble off those pretty little tails, you’ll still be able to tell one swallow from the next! Some of my favorite go-to butterfly identification books are "Butterflies of Indiana" by Jeffrey Belth, "Butterflies of Tennessee" by Rita Venable and "Butterflies through Binoculars" by Jeffrey Glassberg.

Want to learn more about butterflies, specifically the iconic monarch? You, your friends and your family are invited to TNC's eighth annual Festival de la Monarca in East Chicago on Saturday, September 6, 2025. TNC and our partners will welcome the monarch butterflies as they journey across northwest Indiana on their way to Mexico. This festival is FREE and open to all! Come celebrate with educational exhibits, fun activities, music, art, dance and food—as well as TNC's Monarch Experience.