Sculpins typically have tapering bodies and large, bulbous heads with large protruding eyes. They usually have numerous spines, at least on of these on the gill cover. Most of them can change color to blend in with their background, which adds an additional challenge to identification.
With the exception of the Cabezon, most sculpins are quite small. This family inhabits both freshwater and saltwater environments, and live in an incredibly wide depth range, although most settle into life on the sea bottom once they reach adulthood. Many species exist in depths beyond the range of scuba. Only a few live in warm waters; the majority live in temperate and cold latitudes.