an estimated ,. They had poor day vision, short tails, lacked permanent upper incisors, and had a reduced toothcomb. Their diet generally consisted of leaves, with some species being specialized folivores and others having a broader diet, possibly including tough seeds. Monkey lemurs Monkey lemurs, or baboon lemurs, share similarities with macaques; they have also been compared to baboons. Members of the family Archaeolemuridae, they were the most terrestrial of the lemurs, with short, robust forelimbs and relatively flat digits. They spent time on the ground, and were semi-terrestrial, spending time in trees to feed and sleep. They were heavy-bodied and ranged in size from approximately . They had relatively good day vision and large brains compared with other lemurs. Their robust jaws and specialized teeth suggest a diet of hard objects, such as nuts and seeds, yet other evidence, including fecal pellets, suggests they may have had a more varied diet, including leaves, fruit, and animal matter (omnivory). Dental wear analysis has shed some light on this dietary mystery, suggesting that monkey lemurs had a more eclectic diet, while using tough seeds as a fall-back food item. Within the family, the genus Archaeolemur was the most widespread in distribution, resulting in hundreds of subfossil specimens, and may have been one of the last subfossil lemurs to die out. Giant aye-aye An extinct, giant relative of the living aye-aye, the giant aye-aye shared at least two of the aye-aye's bizarre traits: ever-growing central incisors and an elongated, skinny middle finger. These shared features suggest a similar lifestyle and diet, focused on percussive foraging (tapping with the skinny digit and listening for reverberation from hollow spots) of defended resources, such as hard nuts and invertebrate larvae concealed inside decaying wood. Weighing as much as , it was between two-and-half and five times the size of living aye-aye. Alive when humans came to Madagascar, its teeth were collected and drilled to make necklaces. Pachylemur The only extinct member of the family Lemuridae, the genus Pachylemur contains two species that closely resembled living ruffed lemurs. Sometimes referred to as "giant ruffed lemurs", they were approximately three times larger than ruffed lemurs, weighing between . Despite their size, they were arboreal quadrupeds, possibly utilizing more suspensory behavior and cautious climbing than their sister taxon. Their skull and teeth were similar to those of ruffed lemurs, suggesting a diet high in fruit and possibly some