Coluber is a genus of snakes commonly known as racers. These snakes are typically slender and agile, found in various habitats across North America, Europe, and Asia. They are non-venomous and are known for their speed, which helps them catch prey such as small mammals, birds, and lizards. Racers are characterized by their smooth scales and long bodies, often displaying a range of colors from green to brown or black. They are diurnal, meaning they are active during the day, and are often seen basking in the sun. Coluber snakes play an important role in their ecosystems by controlling rodent populations.