represent the range of sizes in living lemurs, though extinct lemurs … Even mouse lemurs… (D) Cytochrome oxidase (CO) staining of a flat-mounted mouse lemur cortex. The mouse lemur and the indri. The visual cortex is clearly delineated (white arrows) by the dark and patchy appearance of the CO staining. The researchers observed more than 120 captive primates in … These patterns are depicted in the plot below. The relationship between brain size and body size continues to tempt and vex attempts to identify the role of cognition in primate evolution. We examined the relationship between group Brain size size, pairbonding, and relative brain size in a sample of 19 lemurs; strepsirrhine primates that last share Sociality a common ancestor with monkeys and apes approximately 75 Ma. Lemurs are woolly-furred, long-tailed, arboreal animals that are found only on the island of Madagascar off the Eastern coast of Africa. Ring-tailed lemurs are diurnal opportunistic omnivores that live in groups of on average 14 individuals ( Gould, Sussman & Sauther, 2003 ; Jolly, 1966b ; Sussmann, 1991 ). Relative to body size, primate brain size: is larger among great apes than among other primates. There are more than 30 different species and dozens of subspecies of lemurs, ranging in size from the 1 ounce mouse lemur, to the 20 pound Indri. A recent study examined the relationship between brain size and the development of motor skills across 36 primate species. an extinct lemur, with a skull larger than a gorilla's, that lived on Madagascar. Besides the obvious size difference — the human brain is about three times larger than the chimp brain — … folivores)! Lemurs perform a range of physical domain challenges as part of the Primate Cognition Test Battery at the German Primate Center (DPZ). (B) A mouse lemur climbing on a branch. frugivores) have larger brains than leaf-eating species (a.k.a. (C) Size comparison of a mouse lemur brain (left) and a rat brain (right; scale bar, 5 mm). When referring to primate brain size and its relation to social intelligence, scientists at Duke University do not think the answer is a simple yes or no. Mouse lemurs have one of the smallest brains among primates, and absolute brain size increases from mouse lemurs over ring-tailed lemurs to ruffed lemurs (Isler et al., 2008). Does size matter? Megaladapis. Instead, only body size and diet explain primate brain size variation – larger bodied species have larger brains, and fruit-eating species (a.k.a. In primates, a large brain size to body size ratio has been associated with a variety of advantageous attributes such as prolonged life span (8), deception (9), and cultural/social intelligence (10).