Dr. Charles van Riper III

Professor, School of Natural Resources and the Environment
USGS Research Scientist Emeritus  

Sonoran Desert Research Station
125 Biological Sciences East ~ University of Arizona ~Tucson, AZ 85721-125
(520) 626-7027 ~ (520) 670-5100 fax ~ (520) 491-0721 call

         twitter with Charles van Riper  
Read More About Dr. van Riper  ~ Visit his Research Lab & Students


During 1998, the USGD and AGFD surveyors covered 6603 hectares over 564.51 hours and detected 153 breeding pairs of Western Yellow-billed Cuckoos.   Therefore an average of 11.7 hectares were surveyed per hour of effort, during which 0.27 breeding pairs were detected per hour, with an average of one pair detected for each 43.2 hectares surveyed.


Hosting Beyond The Sidewalks