Pearly Eyesatyr butterfly, also called brown , a group of delicate butterflies in the family Nymphalidae that are abundant during summer months in the woods and grasslands of the United States and Europe. Adult butterflies have brown wings with a span of 5 to 6 cm (2 to 2.4 inches) and conspicuous circular markings on them. These false “eyes” on the wings may serve to frighten or distract predatory birds.
Some of the best-known satyrs are pearly-eye butterflies. Northern pearly-eyes (E. anthedon) are found mainly in the northeastern region of the United States and in Canada, from central Saskatchewan to Nova Scotia.