The critically endangered Hawaiian Crow or ′Alalā (Corvus hawaiiensis) is currently extinct in the wild and the remaining 115 individuals are being captively managed on Hawai′i and Maui Islands by the Zoological Society of San Diego. Here we provide the first comprehensive analysis of the vocal repertoire of this species. We documented the vocal repertoire of three male-female pairs of ′Alalā during the 2012 breeding season at the Keauhou Bird Conservation Center (KBCC) on Hawai'i Island. Vocalizations were recorded using an automated acoustic recorder placed outside each of three aviaries housing each pair of ′Alalā. A total of 44 hours of recordings were analyzed to describe the structure of vocalizations, call characteristics, and vocal repertoire of this species. We identified 24 different call type categories with fundamental frequencies between 500 Hz–2 kHz. Variation within each call type was observed, as well as variation of similar call types among ′Alalā breeding pairs. Many calls contained a variety of nonlinear dynamical states, including deterministic chaos, frequency jumps, bifurcation, and varying harmonics and subharmonics. These findings provide important baseline information on ′Alalā vocal behavior that may assist future efforts to release these birds back into the wild.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.