The term common agouti designates several rodent species of the genus Dasyprocta. They are related to guinea pigs and look quite similar, but are larger and have longer legs. The species vary considerably in color, being brown, reddish, dull orange, greyish or blackish, but typically with lighter underparts. Their bodies are covered with coarse hair which is raised when alarmed. They weigh 2.4–6 kg (5.3–13.2 lbs.) and are 44.5–76 cm (17.5–29.9 in) in length, with short, hairless tails. Agoutis have five front and three hind toes; the first toe is very small. The tail is very short or nonexistent and hairless. The molar teeth have cylindrical crowns, with several islands and a single lateral fold of enamel. Agoutis may grow to be up to 60 cm (24 in) in length and 4 kg (8.8 lbs.) in weight. Most species are brown on their backs and whitish or buff on their bellies; the fur may have a glossy appearance and then glimmers in an orange color.