Differences in alarm vocalizations of sympatric populations of the whistling rats, Parotomys brantsii and P. littledalei (Rodentia: Muridae)

@article{Roux2002DifferencesIA,
  title={Differences in alarm vocalizations of sympatric populations of the whistling rats, Parotomys brantsii and P. littledalei (Rodentia: Muridae)},
  author={Aliza le Roux and T. P. Jackson and Michael I Cherry},
  journal={Journal of Zoology},
  year={2002},
  volume={257},
  pages={189-194}
}
The alarm vocalizations of the whistling rats Parotomys brantsii and P. littledalei were investigated at the Goegap Nature Reserve in the Northern Cape, South Africa, where they occur sympatrically. Parotomys brantsii's call is a single note vocalization, characterized by an upward frequency sweep and high frequency plateau with a dominant frequency of 10.0 ± 0.3 kHz and duration of 164 ± 11 ms. The alarm whistle of P. littledalei has three overlapping components and is both shorter (53 ± 5 ms… 
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