The California tortoiseshell (Nymphalis californica) is a butterfly of the family Nymphalidae.
The wings of the California tortoiseshell have ragged edges. The upper sides of the wings are orange with black spots and a wide black margin. The undersides of the wings are a mottled dark brown. Its wingspan varies from 3.2 to 7 cm (.mw-parser-output.frac{white-space:nowrap}.mw-parser-output.frac.num,.mw-parser-output.frac.den{font-size:80%;line-height:0;vertical-align:super}.mw-parser-output.frac.den{vertical-align:sub}.mw-parser-output.sr-only{border:0;clip:rect(0,0,0,0);clip-path:polygon(0px 0px,0px 0px,0px 0px);height:1px;margin:-1px;overflow:hidden;padding:0;position:absolute;width:1px}1+1⁄4–2+3⁄4 inches).
Caterpillars are black with white spots and hairs. Each segment of the body has seven spines. They eat various species of Ceanothus.
This butterfly is known for having irregular population explosions. Ravens commonly prey on California tortoiseshells in population explosions during outbreak years.
