| clicking in a killer whale habitat: narrow-band, high-frequency biosonar clicks of harbour porpoise (phocoena phocoena) and dall's porpoise (phocoenoides dalli). | odontocetes produce a range of different echolocation clicks but four groups in different families have converged on producing the same stereotyped narrow band high frequency (nbhf) click. in microchiropteran bats, sympatric species have evolved the use of different acoustic niches and subtly different echolocation signals to avoid competition among species. in this study, we examined whether similar adaptations are at play among sympatric porpoise species that use nbhf echolocation clicks. we u ... | 2013 | 23723996 |