The Apparent Use of Rocks by a Raven in Nest Defense

@article{Janes1976TheAU,
  title={The Apparent Use of Rocks by a Raven in Nest Defense},
  author={S. W. Janes},
  journal={The Condor},
  year={1976},
  volume={78},
  pages={409-409}
}
While conducting a study on raptor populations in Wheeler County, Oregon in 1973, on 7 May, John Barss and I witnessed an incident involving the use of rocks by a pair of Common Ravens (Corvus corex). In the early afternoon we were searching a cliff for a raven nest and observed two ravens individually enter and leave a vertical crack on a 20 m cliff. This crack extended the height of the cliff, and the birds entered it about 13 m above the base. The opening was approximately 2.5 m wide at the… Expand
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