No cost of echolocation for bats in flight

@article{Speakman1991NoCO,
  title={No cost of echolocation for bats in flight},
  author={John R. Speakman and Paul A. Racey},
  journal={Nature},
  year={1991},
  volume={350},
  pages={421-423}
}
ECHOLOCATION has evolved in relatively few animal species1. One constraint may be the high cost of producing pulses, the echoes of which can be detected over useful distances2. The energy cost of echolocation in a small (6 g) insectivorous bat, when hanging at rest, was recently measured at 0.067 Joules per pulse3, implying a mean cost for echolocation in flight of 9.5 × basal metabolic rate (range 7 to 12×). Because flight is very costly4, whether the costs of echolocation and flying are… Expand
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