Abstract
Old World leaf-nosed bats (Hipposideridae) are a family of bat species that use elaborate baffle shapes to diffract the outgoing ultrasonic pulses and the returning echoes. The baffles at both interfaces (“noseleaves” for emission, outer ears for reception) have dynamic geometries that can be changed through muscular actuation. Shape changes in noseleaves and pinnae can both coincide with sound emission and reception respectively, but the relationship between the dynamics in these two structures has yet to be investigated. To study this relationship, a set of no less than 17 landmarks was placed on the noseleaf and one ear of Pratt's roundleaf bats (Hipposideros pratti) to track the dynamic geometry of these structures simultaneously with a high-speed video camera array. The three-dimensional trajectories of the landmark points were reconstructed using stereovision. The results showed strong, systematic relationships between noseleaf and pinna motions that were found to belong to two different qualitative...
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