Humming in bears: a peculiar sustained mammalian vocalization

@article{Peters2010HummingIB,
  title={Humming in bears: a peculiar sustained mammalian vocalization},
  author={Gustav Sigismund Peters and Megan A. Owen and Lynn L. Rogers},
  journal={Acta Theriologica},
  year={2010},
  volume={52},
  pages={379-389}
}
A peculiar sustained vocalization has long been known under various names in several bear species but not been studied in sufficient detail. Based on a critical survey of the relevant literature, analyses of tape recordings and pertinent own observations we tried to clarify the presence of this vocalization in the species of the Ursidae as well as its structural characteristics and specific mode of sound production. To avoid confusion with other vocalization types we introduce the term humming… 
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