Big brown bats can discriminate among objects using wideband FM sonar sounds. They can perceive only the acoustic dimensions of echoes (e.g., delay, frequency, amplitude), or they can use those dimensions to reconstruct object features (e.g., distance, shape, size). To investigate this question, bats were presented with two‐alternative (left/right) forced‐choice sonar discrimination tasks. In experiment 1, the stimuli were a one‐cylinder monopole target and a two‐cylinder dipole target that were presented at all aspect angles. In experiment 2, the stimuli were multiple two‐cylinder dipole targets presented at all aspect angles. In both experiments, the positive target was the dipole with a 5‐cm separation (negative targets had separations of 1–7 cm). Acoustic dimensions of the dipole echoes change depending on the aspect angle. If the bats represent only acoustic dimensions, they should have difficulty selecting the positive target at many aspects. If the bats represent object features, they should be able to select the positive target independent of aspect angle. Bats perform well, suggesting that they reconstruct object features from echo acoustic dimensions. Errors appear due to masking of either the monopole glint with the dipole glints or the dipole glints with each other. [Work supported by NIH and ONR.]