Brachylagus coloradoensisBrachylagus coloradoensis is an extinct species of lagomorph closely related to the pygmy rabbit . Its fossils have been found in Early and Middle Pleistocene deposits in Colorado and Nevada.DescriptionBrachylagus coloradoensis was slightly larger than the living pygmy rabbit. Its enamel patterns show intermediate characteristics between the pygmy rabbit and the extinct genus Hypolagus, which suggests that Brachylagus evolved from the latter.