Cooperative Research Units
Education, Research And Technical Assistance For Managing Our Natural Resources
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Basal Hollow Roost Selection

Townsend's big-eared bat researchers in the field.


June 2017 - June 2019


Basal Hollow Roost Selection project addresses a lack of information and roosting habitat for Townsend's big-eared bat (Corynorhinus townsendii, COTO) and other bat species identified as Species of Greatest Conservation Need in the California Department of Fish and Wildlife 2015 State Wildlife Action Plan. The purpose of this study is to determine the extent of use of basal hollows by COTO and other bat species and to provide land managers with specific criteria to identify and protect COTO roosting habitat.


Current Staff

Federal Staff: 95

Masters Students: 239

Phd Students: 144

Post Docs: 55

University Staff: 239

5 Year Summary

Students graduated: 670

Scientific Publications: 1897

Presentations: 4193



  • Margaret WilzbachCo-Principal Investigator
  • Amon ArmstrongStudent
  • Mark HendersonCo-Principal Investigator

Funding Agencies

  • California Department of Fish and Wildlife


Cooperative Research Units Program Headquarters Cooperators

  1. U.S. Geological Survey