Hole Selection by Nesting Swifts in Medieval City-Walls of Central Spain

  title={Hole Selection by Nesting Swifts in Medieval City-Walls of Central Spain},
  author={Luis Corrales and Luis M. Bautista Sopelana and Tom{\'a}s Santamar{\'i}a and Pedro Mas},
Summary. Disturbance and predation risks from terrestrial animals decline the higher up the nest sites selected by birds that nest in wall cavities are located. Terrestrial predators can also negate the protective quality of higher nesting sites by approaching from above in walls. It is unknown how terrestrial predation risks from below and above walls determine nest site selection in cavity-nesting species. In relation to this situation, we describe nest-site selection in common swifts Apus… 
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