POSITIONAL BEHAVIOR IN CAPTIVE AYE-AYES (DAUBENTONIA-MADAGASCARIENSIS)

The aye-aye shows numerous special features in its postcranial skeleto n, partly in association with its unusual feeding habits and partly in association with locomotor specialisation connected with the possessi on of claws. This study examined the positional behaviour of 3 captive adult aye-ayes in order to throw light on these morphological special isations. Locomotion was dominated by quadrupedal walking and climbing . Given the relatively large body size of aye-ayes, an unexpectedly hi gh frequency of head-first descent was observed. This may provide an e xplanation for two characteristics of aye-ayes: robusticity of the sho ulder girdle and high compressive and bending strengths of the humerus . Agile leaping was also observed, contrasting with previous reports t hat this species is characterised by slow, cautious movement. Specific morphological features that are shared with slow-moving lorisids may be attributable to a combination of frequent headfirst descent and pos tural suspension.