Yellow Bear caterpillar. Spilosoma virginica. Larval form of the adult Virginian Tiger Moth. Insect. Photograph taken and design created by the author. Copyright © 2025 Now I Wonder. All rights reserved.

Wild Facts About The Yellow Bear Caterpillar

ByChristine Wild Animals

Wild Facts About The Yellow Bear Caterpillar

Common Name(s)
  • NOTE: The larval and adult forms of this species have different common names.
  • Larval Form (i.e. caterpillar):
    • Yellow Bear
    • Ginger Bear
  • Adult Form (i.e. moth):
    • Virginian Tiger Moth

Scientific Name
  • Spilosoma virginica

Animal Type
  • Phylum: Arthropoda (arthropods)
  • Class: Insecta (insects)
  • Order: Lepidoptera (butterflies and moths)
  • Family: Erebidae (erebid and underwing moths)

Size
  • Caterpillars (larvae) grow up to 1.8 inches (4.5 cm) in total body length (Wagner 2005).

Appearance

General Appearance of Adult Moths

  • Adult Virginian Tiger Moths are bright white overall with white wings, legs, and thoraxes.
  • Thorax is covered in thick, white fur.
  • Abdomen is white with black dorsal spots running down the length.
  • Males and females look similar.

Appearance Of Juveniles

  • Yellow Bear caterpillars vary in color; individuals can be:
    • Yellow (early instars especially)
    • Brown
    • Red-brown
    • Tan
    • Nearly black
  • Body is thickly covered in setae composed of both short and long hairs.
    • The longest hairs are approximately three times the length of the shorter hairs.
    • Overall, the setae on Yellow Bear caterpillars look softer and less stiff and bristly than those on other commonly encountered moth caterpillars, like the Woolly Bear (Pyrrharctia isabella) and the Agreeable Tiger Moth (Spilosoma congrua)
Yellow Bear caterpillar. Spilosoma virginica. Larval form of the adult Virginian Tiger Moth. Insect. Photograph taken and design created by the author. Copyright © 2025 Now I Wonder. All rights reserved.
Yellow Bear caterpillar Spilosoma virginica Larval form of the adult Virginian Tiger Moth Insect Photograph taken and design created by the author Copyright © 2025 Now I Wonder All rights reserved

Habitat
  • Meadows.
  • Gardens.
  • Forests.

Diet
  • Herbivore.
  • Generalist feeder.
    • Generalist feeders eat a wide variety of plant leaves, some of which have economic importance to humans.

Active Time
  • Yellow Bear caterpillars are diurnal (day-active).
  • Adult Virginian Tiger Moths are nocturnal (night-active).

Range
  • Yellow Bear caterpillars are found throughout the eastern United States.
    • Range extends south into Florida and west to Texas.

Season(s)
  • May through November.

Predators and Threats

Natural Predators

  • Insect-eating predators prey on adult Virginian Tiger Moths, especially bats.
  • Yellow Bear caterpillars may be slightly protected by their dense and long body hairs from some insect-eating predators.

Threats

  • Yellow Bear caterpillars may be negatively impacted by pesticides and insecticides, and may be parasitized by various organisms.
  • Habitat and food plant loss is always a concern for wild animals. However, since Yellow Bear caterpillars are generalist feeders and eat a wide variety of plants, they may be less susceptible to these challenges than other animals.

Just Because You Can Eat Something, Doesn’t Mean You Should
  • Damage inflicted onto plant leaves by the feeding of Yellow Bear caterpillars cause some plants, like St. John’s Wort, to release defensive chemicals.
  • St. John’s Wort is used as an over-the-counter treatment for mild depression and it is possible that any therapeutic effect provided by the plant is related to the presence of these defensive chemicals.
  • Yellow Bear caterpillars fed on St. John’s Wort avoided the glands in the leaves that contain the toxic compounds and fed along the leaf margins.

Close Cousins But Different Species
  • Another closely related moth species to the Yellow Bear / Virginian Tiger Moth is the Agreeable Tiger Moth (Spilosoma congrua).
  • Although closely related in the same genus, these two moths look very different as caterpillars (larvae).
  • The two species also differ in how they manage feeding on many different plant species, many of which manufacture toxic compounds to defend against feeding by these tiger moth caterpillars.
    • For example, in one study, Agreeable Tiger Moth caterpillars sequestered toxic iridoid glycosides in their body tissues, whereas researchers were unable to detect levels of these chemicals in Yellow Bear / Virginian Tiger Moth caterpillars (small amounts were found in the Yellow Bear caterpillars’ frass) (Bowers and Stamp 1997, https://doi.org/10.1023/A:1022535631980)

Yellow Bear Caterpillar Photo Gallery

See all Yellow Bear Caterpillar Photos here

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Christine
Christine is the creator and author of NowIWonder.com, a website dedicated to the animals and plants that share our world, and the science that helps us understand them. Inspired by lifelong exploration and learning, Christine loves to share her knowledge with others who want to connect with wild faces and wild spaces.
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