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About the Cover
Cover: Glossophagine nectarivorous bats use echolocation to find and approach nocturnal flowers in the dense growth of tropical rainforests. Such flowers often have bell-shaped concave corollas. To shed light on echoacoustic perception of concave forms by bats, R. Simon et al. (pp. 3599-3609) trained them to discriminate hollow hemispheres by size using echolocation. The minimum size difference necessary for discrimination was a constant percentage of the overall hemisphere size. Echo spectra of hollow hemispheres were constant over a wide range of angles of sound incidence (see spectral directional pattern plot). Echoes of the training objects differed in amplitude, temporal and spectral pattern in a size-dependent manner.
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