The Amazon ox manatee is gray and bears a white patch on its chest or several white markings on its chest and abdomen. Its body is covered with fine hairs and its upper and lower lips are covered with thick bristles. It has two axillary mammae. The largest manatee recorded was a male 2.8m in length.
Average mass: 480000 g.
Average basal metabolic rate: 55.015 W.