Currently viewing the category: "Hickory Horned Devil"
What's That Bug? does not endorse extermination

Subject: Huge Green Caterpillar-like bug
Location: Windber pennsylvania
September 1, 2012 11:36 am
My friend found this huge bug! It resembles a caterpillar, but Ive never seen one w/ these characteristics or of this size! We live In Windber, PA-it is the end of Summer, Sept 1, but she found it yesterday-which was the end of August. It is the end of Summer here, so its been fairly hot.As you can see from the pictures-its green with spikes (black) on its back.
Signature: tammy

Hickory Horned Devil

Hi Tammy,
This Hickory Horned Devil is arguably the most spectacular North American caterpillar.  It is also considered the largest North American Caterpillar.  We love getting photos of Hickory Horned Devils toward the end of each summer.  The adult Royal Walnut Moth, which makes an appearance during the early part of summer, is also a spectacular looking insect.

What's That Bug? does not endorse extermination

Strange caterpillar or what?
Location: Ellicott City, MD
October 20, 2011 9:19 pm
I’ve tried to look through your photos of caterpillars to identify this one. We took this picture this past August while hiking at a local state park, next to the river. I can’t seem to look through very many of your pictures because they creep me out, much like this one did! It is neat at the same time though and I would like to find out what it really is. It was pretty large as you can see, next to my 7 year old’s shoe. We didn’t want to get too close as it was moving across the rock. Thanks for any information you can give me!
Signature: Tracey

Hickory Horned Devil

Dear Tracey,
You had the good fortune to observe the largest caterpillar in North America, the Hickory Horned Devil.  Though your sighting is two months old, we have decided to post it anyways since the last Hickory Horned Devil sightings might still occur, though most of our sightings are in August and September.  We did not receive as many sightings this past year as we have previously.

Hickory Horned Devil

What's That Bug? does not endorse extermination

whats this bug???
Location: odenville,al just n.e. of birmingham,al
September 17, 2011 1:15 pm
This bug was in my yard in odenville,al….
Signature: just wondering paw pawo

Hickory Horned Devil

Dear paw pawo,
The Hickory Horned Devil is North America’s largest caterpillar, and it is also probably the most unforgettable looking.  Despite its large size, frightening appearance, and diabolical name, it is perfectly harmless.

What's That Bug? does not endorse extermination

crazy creature?
Location: ohio, united states
August 12, 2011 9:12 am
can you tell me what kind of creature this is? we found it at work the other day, and maybe what it eats?? thanks.
Signature: christy

Hickory Horned Devil

Hi Christy,
We thought this might be an earlier instar of a Hickory Horned Devil, but according to BugGuide, it is a chocolate brown form of the typically green giant caterpillar.  We still believe your caterpillar will continue to grow and eventually turn green.  BugGuide states:  “Larvae feed on leaves of ash, burning bush, butternut, cotton, gum, hickory, lilac, pecan, persimmon, sumac, sycamore, and walnut.”

What's That Bug? does not endorse extermination

Crazy Caterpillar
Location: Plant City, FL
August 1, 2011 8:49 am
Dear Bugman,
My cousin and I were out touring Dinosaur World when we saw this massive and ornately decorated caterpillar. We thought it was so exotic looking and were wondering what it was called and what kind of butterfly it will eventually turn into?
Signature: Trini & Amii

Hickory Horned Devil

Dear Trini and Amii,
This is a Hickory Horned Devil, and it will metamorphose into a Royal Walnut Moth.

What's That Bug? does not endorse extermination

Could u help me with this bug please?
Location: Bradstown ky
July 29, 2011 11:49 am
My friend found this caterpillar by the creek in our back yard. The closets thing i can find in your section is the Hickory Horned Devil? I am going to try to keep it and watch it transform but need to know what it is and how to take care of it.
Signature: Sue

Pre-Pupal Hickory Horned Devil

Hi Sue,
You are correct.  This is a Hickory Horned Devil, and it is pre-pupal, meaning it is about to pupate.  Hickory Horned Devils pupate underground.  For some reason, this individual did not bury itself.  You can put it in a container with loose earth and lightly bury it.  You will need to keep it from drying out, but the earth should not get soggy.  An adult moth should emerge next June or July.  You should keep it in a sheltered place over the winter that does not get too warm, like an unheated porch or garage.

What's That Bug? does not endorse extermination