Maryland designated the calico as the official state cat in 2001. Its colors of orange, black, and white are shared with the Baltimore oriole (State bird) and the Baltimore Checkerspot butterfly (State insect).

Calico is not a breed of cat, but an unusual coloring occurring across many breeds. Virtually all calico cats are female; a male calico is a genetic anomaly and usually sterile.

A calico cat must be a tri-color (with its three colors in distinct patches, not mixed as in a tortoiseshell cat). Some breed standards specify what percentage of the body must be white; others allow tabby striping in the color patches. To be a true tri-color, a calico cat's colors must be: white; red or cream; and black, blue, chocolate, lilac, cinnamon, or fawn. Cats are also recognized as state symbols in Maine (Maine coon cat) and in Massachusetts (tabby cat).

Source:

Maryland Symbols - State Cat: Maryland at a Glance

Links:

State Animals - Mammals: 50 States List