1. Jones, G. Scaling of echolocation call parameters in bats. J. Exp. Biol. 202, 3359–3367 (1999)
2. Barclay, R. M. R. & Brigham, R. M. Prey detection, dietary niche breadth, and body size in bats: why are aerial insectivorous bats so small? Am. Nat. 137, 693–703 (1991)
3. Houston, R. D., Boonman, A. M. & Jones, G. Do echolocation signal parameters restrict bats' choice of prey? In Echolocation in Bats and Dolphins (eds Thomas, J. A., Moss, C. F. & Vater, M ) 339–345 (Chicago Univ. Press, 2004)
4. Mogensen, F. & Møhl, B. Sound radiation patterns in the frequency domain of cries from a vespertilionid bat. J. Comp. Physiol. 134, 165–171 (1979)
5. Dietz, C., von Helversen, O. & Nill, D. Handbuch der Fledermäuse Europas und Nordwestafrikas: Biologie, Kennzeichen, Gefährdung 1st edn (Kosmos, 2007)