Myrmica rubra, commonly known as the European fire ant, is a species of ant belonging to the genus Myrmica. These ants are reddish-brown in color and measure around 4-5 mm in length. They are known for their aggressive behavior and can deliver painful stings when threatened. Myrmica rubra colonies are typically found in moist habitats such as forests and grasslands, where they build small mounds for nesting.