I found this caterpillar in in El Cerrito, CA and was wondering what kind it is?
Best assumption, Gulf Fritillary Caterpillar (Agraulis vanillae). I could be wrong though.
The larva is a caterpillar which grows to approximately 4 cm (1.6 in) in length. It is bright orange in color and covered in rows of black spines. The spines are soft to the touch and do not sting, but the larva is poisonous if eaten. Source: Wikipedia.